Nutritional sensitivity of animal production, (gut) health and environmental footprint. My studies range from strategic to applied, addressing research questions in both monogastric and ruminant farm animals as well as in laboratory rodents. I am interested in developing discipline-based concepts across species in relation to nutrition, which form the basis of my research and teaching activities, and is a main driver for our Monogastric Science Research Centre.

2014-now: Principles in Animal Nutrition (module leader; University of Edinburgh)

2018-now: Dissertation supervision. Applied Animal Science (SRUC)

2020-now: Basic Animal Nutrition and Digestion (module co-leader/lecturer; SRUC)

2020-now: Nutrient Requirements and Diet Formulation (module leader/lecturer; SRUC)

2020-now: Feed composition and Evaluation. MSc Animal Nutrition (course leader, University of Glasgow/SRUC)

2021-now: Strategic Animal Nutrition (module leader/lecturer; SRUC)

2021-now: Applied Animal Nutrition (module leader/lecturer; SRUC)

2021-now: Applied Nutrition and Rationing - monogastrics. MSc Animal Nutrition (course leader, University of Glasgow/SRUC)

2021-now: Feed Processing - monogastrics. MSc Animal Nutrition (course leader, University of Glasgow/SRUC)

2022-now: Dissertation supervision. MSc Animal Nutrition (University of Glasgow/SRUC)

2023-now: Livestock Management Systems (guest lecturer/SRUC)

2026-now: Animal Management (module co-leader; SRUC)

2007-2020: Pharmacology in Animal Health (guest lecturer; SRUC)

2010-2019: Agricultural Technology (guest lecturer; SRUC)

2011-2019: Pig Nutrition and Health (guest lecturer; University of Edinburgh)

2015-2020: Animal Feed Technology (lecturer/module leader; SRUC)

2018-2019: Advanced Poultry Nutrition (module leader, SRUC/University of Glasgow)

2019-2022: Animal Systems in Global Academy (guest lecturer; University of Edinburgh)

2020-2024: Advances in Livestock Production and Technologies (guest lecturer/SRUC)

2003-2006: Heidi Normanton (PhD, principle supervisor)

2004-2007: Kostas Zaralis (PhD, co-supervisor)

2006-2009: Alemayehu Kidane (PhD, principle supervisor)

2006-2009: Jennifer Coltherd (PhD, principle supervisor)

2006-2007: Amanda Miller (MRes, co-supervisor)

2007-2009: Katie Stephen (MPhil, co-supervisor)

2007-2010: Panos Sakkas (PhD, principle supervisor)

2007-2010: Stephanie Matheson (PhD, co-supervisor)

2008-2012: Gulbeena Saleem (PhD, principle supervisor)

2012-2017: Sokratis Ptochos (PhD, co-supervisor)

2012-2016: Jolinda Pollock (PhD, principle supervisor)

2013-2017: Ketema Tolossa (PhD, principle supervisor)

2013-2017: Aya Masuda (PhD, co-supervisor)

2016-2020: Salvatore Galgano (PhD, principle supervisor)

2017-2021:  Marwa Hussan (PhD, principle supervisor)

2018-2025:  Zulfa Insani (PhD, co-supervisor)

2021-2026:  Eleanor Hewett (PhD, co-supervisor)

2024-now: Miranda Dosi (PhD, co-supervisor)

2025-now: Phillip Nedd (PhD, co-supervisor)

2026-now: Rebecca Ross (PhD, co-supervisor)

Research outputs (papers, book chapters, full conference papers)

Papers

Houdijk, J.G.M., Bosch, M.W., Verstegen, M.W.A., and Berenpas, H.J. (1998). Effects of dietary oligosaccharides on the growth performance and faecal characteristics of young growing pigs. Animal Feed Science and Technology 71:35-48.

Houdijk, J.G.M., Bosch, M.W., Tamminga, S., Verstegen, M.W.A., Berenpas, H.B., and Knoop, H. (1999). Apparent ileal and total tract nutrient digestion by pigs as affected by dietary nondigestible oligosaccharides. Journal of Animal Science 77: 148-158.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F., Huntley, J.F. and Coop, R.L. (2000). Can an increased intake of metabolizable protein affect the periparturient relaxation in immunity against Teladorsagia circumcincta in sheep? Veterinary Parasitology 91: 43-62.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2001). The relationship between protein nutrition, reproductive effort and breakdown in immunity to Teladorsagia circumcincta in periparturient ewes. Animal Science 72: 595-606. 

Houdijk, J.G.M., Kyriazakis, I., Coop, R.L. and Jackson, F. (2001). The expression of immunity to Teladorsagia circumcincta in ewes and its relationship to protein nutrition depend on body protein reserves. Parasitology 122: 661-672.

Houdijk, J.G.M., Jessop, N.S. and Kyriazakis, I. (2001). Nutrient partitioning between reproductive and immune functions in animals. Proceedings of the Nutrition Society 60: 515-525.

Houdijk, J.G.M., Verstegen, M.W.A., Bosch M.W. and Van Laere, K.M.J., (2002). Dietary fructooligosaccharides and transgalactooligosaccharides can affect fermentation characteristics in gut contents and portal plasma of growing pigs. Livestock Production Science 73: 175-184.

Houdijk, J.G.M., Hartemink, R., Bosch, M.W. and Verstegen, M.W.A., (2002). Effects of dietary non-digestible oligosaccharides on microbial characteristics of ileal chyme and faeces in weaner pigs. Archives of Animal Nutrition 56: 297-307.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F., Huntley, J.F. and Coop, R.L. (2003). Is the allocation of metabolisable protein prioritised to milk production rather than to immune functions in Teladorsagia circumcincta infected lactating ewes? International Journal for Parasitology 33: 327-338.

Houdijk, J.G.M., Jessop, N.S. Knox, D.P. and Kyriazakis, I. (2003). Breakdown of immunity to Nippostrongylus brasiliensis in lactating rats. British Journal of Nutrition 90: 809-814.

Huntley, J.F., Jackson, F., Coop, R L., Macaldowie, C., Houdijk, J.G.M., Familton, A.S., Xieh, H.L., Stankiewicz, M. and Sykes, A.R. (2004). The sequential analysis of local inflammatory cells during abomasal nematode infection in periparturient sheep. Veterinary Immunology and Immunopathology 97: 163-176.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F., Huntley, J.F. and Coop, R.L. (2005). Effects of protein supply and reproductive status on local and systemic immune responses to Teladorsagia circumcincta in sheep. Veterinary Parasitology 129: 105-117.

Houdijk, J.G.M., Jessop, N.S. Knox, D.P. and Kyriazakis, I. (2005). Secondary infection of Nippostrongylus brasiliensis in lactating rats is sensitive to dietary protein content. British Journal of Nutrition 93: 493-499.

Bricarello, P.A., Amarante, A.F.T., Rocha, R.A., Cabral Filho, S.L., Huntley, J.F., Houdijk, J.G.M., Abdalla, A.L. and Gennari, S.M. (2005) Influence of dietary protein supply on resistance to experimental infections with Haemonchus contortus in Ile de France and Santa Ines lambs. Veterinary Parasitology 134: 99-109.

Houdijk, J.G.M., Jackson, F., and Kyriazakis, I. (2006). Rapid improvement of immunity to Teladorsagia circumcincta is achieved through a reduction in the demand for protein in lactating ewes. International Journal for Parasitology 36: 219-227.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2006). The effect of dietary protein supply on the performance and risk of post-weaning enteric disorders in newly weaned pigs. Animal Science 82: 327-335.

Ketzis, J.K., Vercruysse, J., Stromberg, B.E., Larsen, M., Athanasiadou S. and Houdijk, J.G.M. (2006). Establishing performance requirements for novel methods of controlling helminth infections in ruminants. Veterinary Parasitology 139: 321-335.

Kyriazakis, I. and Houdijk, J.G.M. (2006). Immunonutrition: nutritional control of parasites. Small Ruminant Research 62: 79-82.

Normanton, H., Houdijk, J.G.M., Jessop, N.S. Knox, D.P. and Kyriazakis, I. (2007). The effects of changes in nutritional demand on gastrointestinal parasitism in lactating rats. British Journal of Nutrition 97: 104-110.

Wellock, I.J., Houdijk, J.G.M. and Kyriazakis, I. (2007). Effect of dietary non-starch polysaccharide solubility and inclusion level on gut health and the risk of post weaning enteric disorders in newly weaned piglets. Livestock Science 108:186-189.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2007). Effect of weaning age, protein nutrition and enterotoxigenic Escherichia coli challenge on the health of newly weaned piglets. Livestock Science 108:102-105.

Houdijk, J.G.M., Campbell, F.M., Fortomaris, P.D., Eckersall, P.D. and Kyriazakis, I. (2007). Effects of sub-clinical post weaning colibacillosis and dietary protein on acute phase proteins in weaner pigs. Livestock Science 108: 182-185.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2008).  The interaction between dietary protein supply, weaning age and enterotoxigenic  Escherichia coli infection on the performance and health of newly weaned pigs: 1) performance. Animal 2: 825-833.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2008).  The interaction between dietary protein supply, weaning age and enterotoxigenic  Escherichia coli infection on the performance and health of newly weaned pigs: 2) health. Animal 2: 834-842.

Athanasiadou, S., Houdijk, J.G.M. and Kyriazakis, I. (2008). Exploiting synergisms and interactions in the nutritional approaches to parasite control in sheep production systems. Small Ruminant Research 76: 2-11.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M., Wiseman, J. and Kyriazakis, I. (2008).  The consequences of non-starch polysaccharide solubility and inclusion level on the health and performance of weaned pigs challenged with enterotoxigenic Escherichia coli. British Journal of Nutrition 99: 520-530.

Houdijk, J.G.M. (2008). Influence of periparturient nutritional demand on resistance to parasites in livestock. Parasite Immunology 30: 113-121.

Zaralis, K., Tolkamp, B.J., Houdijk, J.G.M, Wylie, A.R.G. and Kyriazakis, I.  (2008). Food intake and plasma leptin concentrations during gastrointestinal parasitism in lambs of two breeds. Journal of Animal Science 86: 1891-1903.

Zaralis, K., Tolkamp, B.J., Houdijk, J.G.M, Wylie, A.R.G. and Kyriazakis, I.  (2009). Consequences of protein supplementation on anorexia, expression of immunity and plasma leptin concentrations in parasitised ewes of two breeds. British Journal of Nutrition 101: 499-509.

Houdijk, J.G.M., Jackson, F. and Kyriazakis, I. (2009). Nutritional sensitivity of resistance to Trichostrongylus colubriformis in lactating ewes.  Veterinary Parasitology 160: 258-266.

Wellock, I.J., Houdijk, J.G.M., Miller, A.C., Gill, P.B. and Kyriazakis, I. (2009).  The effect of weaner diet protein level and diet quality on the long-term performance of pigs to slaughter. Journal of Animal Science 87: 1261-1269.

Coltherd, J.C., Bünger, L., Kyriazakis, I. and Houdijk, J.G.M. (2009) Genetic growth potential interacts with nutrition on the ability of mice to cope with Heligmosomoides bakeri infection.  Parasitology 136: 1043-1055.

Jones, L.A., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I.  (2009) Immunomodulatory effects of dietary protein during Nippostrongylus brasiliensis re-infection in lactating rats.  Parasite Immunology 31: 412-421.

Kidane, A., Houdijk, J.G.M., Tolkamp, B.J., Athanasiadou, S., and Kyriazakis, I. (2009). Consequences of infection pressure and protein nutrition on periparturient resistance to Teladorsagia circumcincta and performance in ewes. Veterinary Parasitology 165: 78-87.

Kidane, A., Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J. and Kyriazakis, I. (2010). Effects of maternal protein nutrition and subsequent grazing on chicory (Cichorium intybus) on parasitism and performance of lambs. Journal of Animal Science 88: 1513-1521.

Kidane, A., Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J. and Kyriazakis, I. (2010). Nutritional sensitivity of periparturient resistance to nematode parasites in two breeds of sheep with different nutrient demands. British Journal of Nutrition 104: 1477-1486.

Rooke, J.A., Houdijk, J.G.M., McIlvaney, K., Ashworth, C.J. and Dwyer, C.M. (2010). Differential effects of maternal undernutrition between days one and ninety of pregnancy on ewe and lamb performance and lamb parasitism in hill or lowland breeds. Journal of Animal Science 88: 3833-3842.

Jones, L.A., Houdijk, J.G.M., Sakkas, P., Bruce, A.D., Mitchell, M., Knox, D.P. and Kyriazakis, I (2011). Dissecting the impact of protein versus energy host nutrition on the expression of immunity to gastrointestinal parasites during lactation. International Journal for Parasitology 41, 711-719.

Sakkas, P., Houdijk, J.G.M., Jones, L.A., Knox, D.P. and Kyriazakis, I. (2011). Dietary protein and energy supplies differentially affect resistance to parasites in lactating mammals. British Journal of Nutrition 106, 1207-1215.

Rocha, R.A., Bricarello, P.A., Silva M.B., Houdijk, J.G.M., Almeida, F.A., Cardia, D.F.F. and Amarante A.F.T. 2011. Influence of protein supplementation during late pregnancy and lactation on the resistance of Santa Ines and Ile de France ewes to Haemonchus contortus. Veterinary Parasitology 181, 229-238.

Coltherd, J.C., Babayan, S.A., Bünger, L., Kyriazakis, I., Allen, J.E. and Houdijk, J.G.M. (2011). Interactive effects of protein nutrition, genetic growth potential and Heligmosomoides bakeri infection pressure on resilience, resistance and serum antibodies in mice. Parasitology 138, 1305-1315.

Athanasiadou, S., Jones, L.A., Burgess, S.T.G., Kyriazakis, I., Pemberton, A.D., Houdijk, J.G.M. and Huntley, J.F. (2011). Genome-Wide transcriptomic analysis of intestinal tissue to assess the impact of nutrition and a secondary nematode challenge in lactating rats. PLoS One 6(6): e20771. doi:10.1371/journal.pone.0020771.

Houdijk, J.G.M., Kyriazakis, I., Kidane, A. and Athanasiadou, S. (2012). Manipulating small ruminant parasite epidemiology through the combination of nutritional strategies. Veterinary Parasitology 186: 38-50.

Houdijk, J.G.M. (2012). Differential effects of protein and energy scarcity on resistance to nematode parasites. Small Ruminant Research 103, 41-49.

Sakkas, P., Houdijk, J.G.M., Athanasiadou, S. and Kyriazakis, I. (2012). Sensitivity of periparturient breakdown of immunity to parasites to dietary protein source. Journal of Animal Science 90, 3954-3962.

Jones, L.A., Sakkas, P., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I (2012). Amelioration of the periparturient relaxation of immunity to parasites through a reduction in mammalian reproductive effort. International Journal for Parasitology 42, 1127-1134.

Sakkas, P., Jones, L.A., Houdijk, J.G.M., Athanasiadou, S., Knox, D.P. and Kyriazakis, I. (2013). Leucine and methionine deficiency impair immunity to gastrointestinal parasites during lactation. British Journal of Nutrition 109, 273-282.

Smith, L.A., Houdijk, J.G.M., Homer, D. and Kyriazakis, I. (2013). Effects of dietary inclusion of peas and faba beans as a replacement for soybean meal on grower and finisher pig performance and carcass quality. Journal of Animal Science 91, 3733-3741.

Tolossa, K., Debela, E., Athanasiadou, S., Tolera, A., Ganga G. and Houdijk J.G.M. (2013). Ethno-medicinal study of plants used for treatment of human and livestock ailments by traditional healers in South Omo, Southern Ethiopia. Journal of Ethnobiology and Ethnomedicine 9:32.

Ricci, P., Chagunda, M.G.G., Rooke, J., Houdijk, J.G.M., Duthie, C.-A., Hyslop, J., Roehe, R., and Waterhouse, A. (2014). Evaluation of the laser methane detector to estimate methane emissions from ewes and steers. Journal of Animal Science 92, 5239–5250.

Athanasiadou, S., Tolossa, K., Debela, E., Tolera, A. and Houdijk, J.G.M., 2015. Tolerance and resistance to a nematode challenge are not always mutually exclusive. International Journal for Parasitology 45, 277-282.

White, G., Smith, L.A., Houdijk, J.G.M., Kyriazakis, I. and Wiseman, J., 2015. Replacement of soya bean meal with peas and faba beans in growing / finishing pig diets: effect on performance, carcass composition and nutrient excretion. Animal Feed Science and Technology 209, 202-210.

Olukosi, O.A., Combémorel, C., Kightley, S., Wiseman, J. and Houdijk, J.G.M. 2015. True digestibility of phosphorus determined by regression method for double zero rapeseed meal. Livestock Science 182, 8–10.

Kasprzak, M.M., Houdijk, J.G.M., Kightley, S., Olukosi O.A., White G.A., Carre P., and Wiseman J. 2016. Effects of rapeseed variety and oil extraction method on the content and ileal digestibility of crude protein and amino acids in rapeseed cake and softly processed rapeseed meal fed to broiler chickens. Animal Feed Science and Technology 213, 90-98.

Kasprzak, M.M., Houdijk, J.G.M., Olukosi O.A., Appleyard, H., Kightley, S.P.J., Carre P., and Wiseman J. (2017). The influence of oil extraction process of different rapeseed varieties on the ileal digestibility of crude protein and amino acids in broiler chickens. Animal Feed Science and Technology 227, 68-74.

Kasprzak, M.M., Houdijk, J.G.M., Liddell, S., Davis, K., Olukosi O.A., Kightley, S., White G.A. and Wiseman J. (2017). Rapeseed napin and cruciferin are readily digested by poultry. Journal of Animal Physiology and Animal Nutrition 101, 658-666.

Houdijk, J.G.M., Tolkamp, B.J., Rooke, J.A. and Hutchings, M.R. (2017). Animal health and greenhouse gas intensity: the paradox of periparturient parasitism. International Journal for Parasitology 47, 633-641.

Olukosi O.A., Kasprzak, M.M., Kightley, S.P.J., Carre P., Wiseman J., and Houdijk, J.G.M. (2017). Investigations of the nutritive value of meals of double-low rapeseed and its influence on growth performance of broiler chickens. Poultry Science 96, 3338-3350.

Kasprzak, M.M., Houdijk, J.G.M., Olukosi, O.A., Appleyard, H., Kightley, S.P.J., Carré, P., Sutton, T. and Wiseman, J. (2018). The content and standardized ileal digestibility of crude protein and amino acids in rapeseed co-products fed to pigs. Livestock Science 208, 22-27.

Khattak, F., Paschalis, V., Green, M., Houdijk, J.G.M., Soultanas, P. and Mahdavi, J. (2018). TYPLEX® Chelate, a novel feed additive, inhibits Campylobacter jejuni biofilm formation and cecal colonization in broiler chickens. Poultry Science 97, 1391–1399.

Masuda, A., Houdijk, J.G.M., Allen, J.E. and Athanasiadou S. (2018). Body protein reserves sustained maternal performances in early lactation but dietary protein was necessary to maintain performance and immune responses to Nippostrongylus brasiliensis in lactating rats. Journal of Nutrition 148, 1638–1646.

Fox, N.J., Smith, L.A., Houdijk, J.G.M., Athanasiadou, S. and Hutchings, M.R. (2018). Ubiquitous parasites drive 33% increase in methane yield from livestock. International Journal for Parasitology 48, 1017-1021.

Pollock, J., Gally, D.L., Glendinning, L., Tiwari, R., Hutchings, M.R. and Houdijk, J.G.M. 2018. Analysis of temporal fecal microbiota dynamics in weaner pigs with and without exposure to enterotoxigenic Escherichia coli. Journal of Animal Science 96, 3777–3790.

Olukosi, O.A., Walker, R.L. and Houdijk, J.G.M. 2019. Evaluation of the nutritive value of legume alternatives to soybean meal for broiler chickens. Poultry Science 98, 5778-5788.

Pollock, J., Gally, D.L., Hutchings, M.R., Hutchings, K.E.K. and Houdijk, J.G.M. (2019). Changes in the Ileal, but Not Fecal, Microbiome in Response to Increased Dietary Protein Level and Enterotoxigenic Escherichia coli Exposure in Pigs. Applied and Environmental Microbiology 85, e01252-19.

Lala, A.O., Oso, A.O., Osafo, E.L.K. and Houdijk, J.G.M. (2020). Impact of reduced dietary crude protein levels and phytase enzyme supplementation on growth response, slurry characteristics and gas emissions of growing pigs. Animal Science Journal, e13381.

Lala, A.O. Oso, A.O., Osafo, E.L.K, Houdijk, J.G.M. and Eyarefe, D.O. (2020). Effect of high concentration of phytase supplementation on energy and nutrient digestibility of growing pigs fed with reduced dietary crude protein balanced with limiting amino acids. Livestock Science 240, 104143.

Pollock, J., Glendinning, L., Smith, L.A., Mohsin, H., Gally, D.L., Hutchings, M.R. and Houdijk, J.G.M. (2021). Temporal and nutritional effects on the weaner pig ileal microbiota. Animal Microbiome 3, 58.

Masuda, A., Allen, J.E., Houdijk, J.G.M. and Athanasiadou, S. (2022). Dietary protein supplementation results in molecular and cellular changes related to T helper type 2 immunity in the lung and small intestine in lactating rats re-infected with Nippostrongylus brasiliensis. Parasitology 149, 337-346.

Khattak, F,. Galgano, S. And Houdijk, J.G.M. (2022). Bacterial concentration and Campylobacter spp. quantification differ when fresh or ultra-frozen samples are analysed over time using molecular biology and culture-based methods. PLoS ONE 17(9): e0274682.

Zhang, Y., Lin, Y., Galgano, S., Houdijk, J.G.M., Xie, W., Jin, Y., Lin, J., Song, W., Fu, Y., Li, X., Chui, W., Kan, W., Jia, C., Hu, G. and Li, T. (2022). Recent Progress in Phage Therapy to Modulate Multidrug-Resistant Acinetobacter baumannii, including in Human and Poultry. Antibiotics 11, 1406.

Galgano, S., Conway, L. Di Maggio, F., Farthing, K., Dalby, N., Fellows, A. and Houdijk, J.G.M. (2023). Precursor-derived in-water peracetic acid impacts on broiler performance, gut microbiota and antimicrobial resistance genes. Poultry Science 102, 102368.

Hussein. M.A., Khattak, F., Vervelde, L., Athanasiadou, S. and Houdijk, J.G.M. (2023). Growth performance, caecal microbiome profile, short-chain fatty acids, and litter characteristics in response to placement on reused litter and combined threonine, arginine and glutamine supplementation to juvenile male broiler chickens. Animal Microbiome 5, 18.

Galgano, S., Conway, L. Dalby, N., Fellows, A. and Houdijk, J.G.M. (2023). Encapsulated peracetic acid as a valid broad‑spectrum antimicrobial alternative, leading to beneficial microbiota compositional changes and enhanced performance in broiler chickens. Journal of Animal Science and Biotechnology 14, 83.

Hussein. M.A., Khattak, F., Vervelde, L., Athanasiadou, S. and Houdijk, J.G.M. (2023). Sensitivity of broiler performance, organ weights and plasma constituents to amino acid supplementation and reused litter exposure using ideal protein formulated rations. Animal 17, 100985.

Galgano, S., Kettle, H., Free, A. and Houdijk, J.G.M. (2023). Estimating the contribution of the porcine fecal core microbiota to metabolite production via mathematical modelling and in vitro fermentation. mSystems 9, e0036623.

Galgano, S., Conway, L. Fellows, A. and Houdijk, J.G.M. (2024). Impact of precursor-derived peracetic acid on post-weaning diarrhea, intestinal microbiota and predicted microbial functional genes in weaned pigs. Frontiers in Microbiology 15, 1356538.

Shepherd, F., Houdijk, J.G.M., Chylinski, C., Hutchings, M.R., Kelly, R.F., Macrae, A., Maurer, V., Salminen, J.-P., Engström, M.T. and Athanasiadou, S. (2024). The feeding of heather (Calluna vulgaris) to Teladorsagia circumcincta infected lambs reduces parasitism but can detrimentally impact performance. The Veterinary Journal 303, 106066.

Khattak, F,. Galgano, S., Pedersen, N.R., Hui, Y., Matthiesen R. and Houdijk, J.G.M. (2024). Supplementation of lactobacillus fermented rapeseed meal in broiler diet reduces Campylobacter jejuni caecal colonisation and limits the L-tryptophan and L-histidine biosynthesis pathways. Journal of the Science of Food and Agriculture 104,5474-5485.

Blomstrand, B.M., Thamsborg, S.M., Steinshamn, H., Enemark, H.L., Aasen, I.M., Mahnert, K-C., Sørheim, K.M., Sheperd, F., Houdijk, J.G.M. and Athanasiadou, S. (2025). Pinus sylvestris bark extract reduces the impact of Heligmosomoides bakeri infection on C57BL/6 but not on BALB/c mice (Mus musculus). Parasitology (in press).

Hewett, E., Zaragoza, L., Lewis, C., Houdijk, J.G.M., Wilson, A. and Turner, S. (2025). Exploring the effects of dietary lysine and tryptophan on the social behaviour of pigs. Journal of Animal Science 103, skaf030.

Khattak, F., Galgano, S., Pearson, R., Houdijk, J.G.M., Short, F. and Leigh, A. (2024). Enhancing key broiler welfare indicators, meat quality, and gut microbiome composition using oxygen-enriched drinking water under commercially relevant housing conditions. Poultry Science 104, 105550.

Khattak, F., Mkrtchyan, H., Smallman, D., Estridge, P., Allen, M.J., Short, F., Sutcliffe, M. and Houdijk, J.G.M. (2025). From coastline to feed trough: unlocking Palmaria palmata feed potential for monogastric farm animals. Frontiers in Animal Science 6, 1717400.

Sandilands, V., Khattak, F., and Houdijk, J.G.M. (2025) The effects of providing a sprouted barley supplement to laying hens (Gallus gallus domesticus) on egg production parameters and feather cover. Poultry Science 105, 106161.

Dersjant-Li, Y., Bello, A., Marchal, L., Wang, Q., Gibbs, K. and Houdijk, J.G.M. (2026). Total replacement of soy with alternative plant-based ingredients, feed enzymes and a probiotic in a mixed-cereal broiler diet fed during an entire growth cycle. Animal Feed Science and Technology 335, 116675.

Galgano, S., Conway, L. Fellows, A. and Houdijk, J.G.M. (2026). The antimicrobial alternative precursor-derived peracetic acid and zinc oxide lead to a sex dependent microbial modulation in weaning piglets. Animal 20, 101724.

Galgano, S., Umar-Faruk, M., Eising, I., Houdijk, J.G.M. and Khattak, F. (2026). Dietary muramidase leads to the downregulation of peptidoglycan biosynthesis and to caecal microbial modulation in laying hens. Animal Microbiome 8, 7.

Ortega Cambara, J.C., Cuber, P., Khattak, F., Lebre, P.H., Galgano, S., Houdijk, J.G.M., Smallman, D., Estridge, P., Allen, M.J., Short, F., Sutcliffe, M. and Mkrtchyan, H. (2026). Long-reads metagenomics reveals the effects of Dulse supplementation on the poultry caecal bacteriome and its associated genetic repertoire. Frontiers in Microbiology 17, 1868730.

Zulfa, I.H., Fragkoudis, R., Doeschl-Wilson, A., Houdijk, J.G.M., Chase-Topping, M., Bailey, R.I. and Athanasiadou, S. (2026). Co-infection with a viral pathogen (Theiler’s murine encephalomyelitis virus) tended to improve host tolerance but significantly enhanced resistance to Heligmosomoides bakeri. Veterinary Research Communications 50, 296.

Books and book chapters

Houdijk, J.G.M. (1998). Effects of non-digestible oligosaccharides in young pig diets. Ph.D. Thesis, Wageningen Agricultural University. Ponsen en van Looijen, Wageningen: 184 p.

Houdijk, J.G.M and Athanasiadou, S. (2003). Direct and indirect effects of host nutrition on ruminant gastrointestinal nematodes. In: VI International Symposium on the nutrition of herbivores (eds. L. ‘t Mannetje, L.Ramírez-Avilés, C.A. Sandoval-Castro and J.C. Ku-Vera). Universidad Autónoma de Yucatán, Mérida, pp 213-236.

Kyriazakis, I. and Houdijk, J.G.M. (2007). Food intake and performance of pigs during health, disease and recovery. In: Paradigms in Pig Science (eds. J Wiseman, M.A. Varley, S. McOrist and B. Kemp). Nottingham University Press, Nottingham, pp 493-513.

Athanasiadou, S. and Houdijk, J.G.M. (2010). Nutrition and immunity in animal disease: lessons from parasitic gastroenteritis. In: Dietary Components and Immune Function (eds. R.R. Watson, S. Zibadi and V.R. Preedy). Springer Humana Press, New York, pp 63-74.

Athanasiadou, S., Tolkamp, B.J. and Houdijk, J.G.M. (2011). Effects of nutrition on resistance and resilience of animals to gastro-intestinal parasites. In: Expert meeting on Impact of Animal Nutrition on Animal Welfare. FAO, Rome, Italy. 26-30 September 2011. Fiat Panis, FAO; pp 62-84.  

Houdijk, J.G.M., Smith, L.A., Tarsitano, D., Tolkamp, B.J., Topp, C.E.F., Masey-O’Neill, H., White, G., Wiseman, J., Kightley, S. and Kyriazakis, I. (2013). Peas and faba beans as home grown alternatives for soya bean meal in grower and finisher pig diets. In: Recent Advances in Animal Nutrition 2013, Edited by P.C. Garnsworthy and J. Wiseman. Nottingham University Press, Nottingham, pp. 145-175.

D’Eath, R.B., Jarvis, S., Baxter, E.M. and Houdijk, J.G.M., 2018. Mitigating hunger in pregnant sows. In: Herd and Flock Welfare,Advances in Pig Welfare (ed. Špinka, M.). Woodhead Publishing. pp. 199-234.

Struthers, S., Houdijk, J.G.M. and Hall, H.N., 2025. Black soldier fly meal: an alternative protein source for pigs. In: Casillas, A. (ed), Insects as alternative sources of protein for food and feed, pp. 83–104, Burleigh Dodds Science Publishing, Cambridge, UK.

Hastie, P.M., Farci, V., Houdijk, J.G.M. and Murray, J.-A., 2025. Comparative gut anatomy, physiology and digestive strategies in large animals. In: Brameld, J.M., Athanasiadou, S., Kenny, D.A. and Lanham-New, S.A. (eds). Animal Nutrition. John Wiley & Son Ltd; pp 13-23.

Houdijk, J.G.M., Hussein, M.A. and Khattak, F. 2025. The ideal protein concept for poultry: past, present and prospects. In: Brameld, J.M., Athanasiadou, S., Kenny, D.A. and Lanham-New, S.A. (eds). Animal Nutrition. John Wiley & Son Ltd; pp 145-157.

Full conference papers and abstracts

Houdijk, J.G.M., Van der Poel, A.F.B., and Boer, H. (1993). Using NSI as quality parameter for heat treated beans (Phaseolus vulgaris L. and Glycine max. L.). Proceedings of the 18^th workshop of Dutch Speaking Nutrition Researchers, 16 april 1993, Gent, Belgie; pp 53-54 (in Dutch).

Jansman, A.J.M., Houdijk, J.G.M., and Verstegen, M.W.A. (1993). Effect of condensed tannins in faba beans (Vicia faba L.) on the availability of minerals in pigs. Bioavailability '93. Nutritional, Chemical and Food Processing Implications of Nutrient Availability, Schlemmer U. (ed), BFE, Karlsruhe; pp. 48-52.

Houdijk, J.G.M. and Berenpas, H.B. (1995). The effect of fructooligosaccharides and transgalactooligosaccharides on growth performance and nutrient digestibility in young pigs. Proceedings of the 20^th workshop of Dutch Speaking Nutrition Researchers, 7 april 1995, Leuven, Belgie; pp 18-19 (in Dutch)

Houdijk, J.G.M., Bosch, M.W., Tamminga, S., and Verstegen, M.W.A. (1995). Non digestible oligosaccharides in foods and feeds. Digestive-physiological aspects of non digestible oligosaccharides in young pigs; an introduction to the project. Proceedings of the 1st ORAFTI research conference, M. Roberfroid (ed); pp. 244-248

Hartemink, R. and Houdijk, J.G.M. (1995). Use of oligosaccharides as functional ingredients in foods and feeds. V Congresso de zootecnia, Angra do Heroísmo 1,2,3 de Junho de 1995.

Houdijk, J.G.M., Williams, B.A., Olivier, F., Knoop, H., and Van ‘t End, M. (1996). The cumulative gas production technique as indicator of a changed caecal ecology in young pigs. Proceedings of the 21^th workshop of Dutch Speaking Nutrition Researchers,  26 april 1996, Lelystad, the Netherlands; pp 18-19 (in Dutch).

Houdijk, J.G.M., Williams, B.A., Tamminga, S., and Verstegen, M.W.A. (1997). Relation between in vivo and in vitro fermentation of oligosaccharides in piglets. Proceedings of the British Society of Animal Science: 59.

Houdijk, J.G.M., Williams, B.A., Olivier, F., Knoop, H., and Van ‘t End, M. (1997) The cumulative gas production technique as indicator of differences between ileal, caecal, and faecal microbial ecology in young pigs. Proceedings of the 22^th workshop of Dutch Speaking Nutrition Researchers,  4 april 1997, Merelbeke, Belgium; pp 16-17 (in Dutch)

Houdijk, J.G.M., Bosch, M.W., Verstegen, M.W.A., and Tamminga, S. (1997). Type and level of dietary oligosaccharides change volatile fatty acid composition in ileal chyme of young pigs. Proceedings of the VIIth International Symposium on Digestive Physiology in Pigs, Laplace, J.P., Fevrier, C., and Barbeau, A. (eds), INRA, Saint-Gilles; pp. 475-478

Houdijk, J.G.M., Hartemink, R., Van Laere, K.M.J., Bosch, M.W., Tamminga, S., and Verstegen, M.W.A. (1997). Fructooligosaccharides and transgalactooligosaccharides in weaner pigs’ diet. Proceedings of the International Symposium ‘ Non-digestible oligosaccharides: Healthy Food for the Colon?’, Wageningen, the Netherlands, 4-5 December 1997, (compiler) R. Hartemink, Drukkerij Modern BV, Bennekom; pp. 69-79.

Houdijk, J.G.M., Hartemink, R., and Verstegen, M.W.A. (1997). Dietary non-digestible oligosaccharides affect ileal microflora in young pigs. 48th Annual meeting of the European Association for Animal Production, Van Arendonk, J.A.M. (Editor-in-Chief), Wageningen Pers, Wageningen; p. 87

Schrama, J.W.; Houdijk, J.G.M.; Williams, B.A., and Parmentier, H.K. (1997). Nutrient partitioning in relation to health in pigs. 48th Annual meeting of the European Association for Animal Production, Van Arendonk, J.A.M. (Editor-in-Chief), Wageningen Pers, Wageningen; p. 108

Williams, B.W.; Bosch, M.W.; Houdijk, J.G.M., and Van der Camp, Y. (1997). Differences in fermentative capabilities of flora from different areas of porcine GIT. 48th Annual meeting of the European Association for Animal Production, Van Arendonk, J.A.M. (Editor-in-Chief), Wageningen Pers, Wageningen; p. 133

Houdijk, J.G.M., Hartemink, R., Hoving, J., Hogenes, Y., and Verstegen, M.W.A. (1997). Bacterial concentrations in porcine ileal chyme, caecal contents, and faeces as affected by dietary non-digestible oligosaccharides. Gastro-intestinal Disorders in Juveniles, 15-16 september 1997, ID-DLO, Lelystad, the Netherlands; p. 28.

Houdijk, J.G.M., Williams, B.A.; Tamminga, S. and Verstegen, M.W.A. (1998). Effect of non-digestible oligosaccharides in diets for weaner pigs on in vitro fermentation. Proceedings of British Society of Animal Science: 30.

Houdijk, J.G.M., Kyriazakis, I., Coop, R.L., and Jackson, F. (1999). Effects of metabolizable protein on performance and faecal egg count of the parasitized ewe. Proceedings of the British Society of Animal Science: 17.

Houdijk, J.G.M., Huntley, J.F., Kyriazakis, I., Coop, R.L., and Jackson, F. (1999). Dietary protein affects the periparturient relaxation of immunity in ewes. 17th International Conference of the World Association for the Advancement of Veterinary Parasitology: f4.01.

Houdijk, J.G.M., Kyriazakis, I., Coop, R.L., and Jackson, F. (2000). Effects of protein and energy supply on the resistance to nematodes in pregnant ewes. Proceedings of the British Society of Animal Science: 33.

Houdijk, J.G.M., Kyriazakis, I., Coop, R.L., and Jackson, F. (2000). Protein nutrition, reproductive effort and resistance to nematodes in lactating ewes. Proceedings of the British Society of Animal Science: 34.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2001). Body protein reserves affect periparturient breakdown of immunity to nematodes in ewes. Proceedings of the British Society of Animal Science: 14.

Coop, R.L., Bartley, D., Jackson, E., Houdijk, J.G.M., Kyriazakis, I. and Jackson, F. (2001). Influence of dietary protein on the periparturient relaxation of immunity in parasitized ewes. Proceedings of the 5^th International Conference of the Sheep Veterinary Society: p. 19.

Houdijk, J.G.M., Huntley, J.F., MacKellar, A., Kyriazakis, I., Jackson, F. and Coop, R.L. (2001). Body protein affects expression of immunity to nematodes in ewes. 18^th International Conference of the World Association for the Advancement of Veterinary Parasitology : pp. 30.

Houdijk, J.G.M. (2001). Nematode control in periparturient sheep through protein supplementation. 18^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp. 188.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2002). The metabolizable protein requirement of the parasitized, lactating ewe. Proceedings of the British Society of Animal Science: 74.

Kyriazakis, I., Houdijk, J.G.M. and Coop, R.L. (2002). Immunonutrition: the nutritional control of acquired of immunity to parasites. Proceedings of the British Society of Animal Science: 232.

Houdijk, J.G.M., Kyriazakis, I., Huntley, J.F., Jackson, F., and Coop, R.L. (2002). Temporal effects of protein supply on local immunity in periparturient ewes. Third international conference on Novel Approaches: A workshop meeting on helminth control in livestock in the New Millennium: pp. 34.

Donnan A., Houdijk, J.G.M., Huntley, J.F., MacKellar, A. and Jackson, J. (2002). A method for measuring local antibody in ovine gastric biopsy samples. Annual Meeting of the Irish Society for Parasitology & British Association of Veterinary Parasitologists: pp. 10-11.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2003). Reducing the degree of protein scarcity rapidly increases immunity to nematodes in ewes. Proceedings of the British Society of Animal Science: 30.

Keatinge, R., Houdijk, J.G.M., Jackson, F. and Kyriazakis, I. (2003). The effect of nutrition on nematode faecal egg output in lactating, organically managed ewes. Proceedings of the British Society of Animal Science: 29.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2003). Reducing the degree of protein scarcity rapidly improves expression of immunity to abomasal nematodes in ewes. 19^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp. 117.

Houdijk, J.G.M., Athanasiadou, S. and Kyriazakis, I. (2003). Gastrointestinal nematode control through direct and indirect effects of host nutrition. 19^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp. 118.

Houdijk, J.G.M., Versteegh, Q., Kyriazakis, I., Stenhouse, L., Jackson, F. and Coop, R.L. (2003). Protein supply to lactating ewes affects in vitro larval establishment of abomasal nematodes. 19^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp. 228.

Coop, R.L., Donnan, A., Huntley, J.F., Bartley, D., Jackson, E., Houdijk, J.G.M. and Jackson, F. (2003). Sequential analysis of mucosal inflammatory responses during abomasal nematode infection in ewes. 19^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp. 99.

Bricarello, P.A., Amarante, A.F.T., Houdijk, J.G.M., Rocha, R.A., Cabral Filho, S.L. and Gennari, S.M. (2003). Influence of dietary protein supply on resistance to infection with Haemonchus contortus in Ile de France and Santa Ines lambs. Proceedings of the British Society of Animal Science: 93.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2004). Effects of protein supply on immunity to Trichostrongylus colubriformis in lactating ewes. Proceedings of the British Society of Animal Science: 7.

Houdijk, J.G.M., Kyriazakis, I., Huntley, J.F., Jackson, F. and Coop, R.L. (2004). Temporal effects of protein supply on local immunity to nematodes in periparturient ewes. Proceedings of the British Society of Animal Science: 88.

Houdijk, J.G.M., Kyriazakis, I., Jackson, F. and Coop, R.L. (2004). Changes in protein supply rapidly affect immunity to nematodes in lactating ewes. Proceedings of the British Society of Animal Science: 9.

Houdijk, J.G.M., Anderson, D.H. and Kyriazakis, I. (2005). Induction of experimental sub-clinical post-weaning colibacillosis in pigs. Proceedings of the British Society of Animal Science: 84.

Houdijk, J.G.M., Jessop, N.S., Knox, D.P. and Kyriazakis, I. (2005). Nutritional control of gastrointestinal parasitism in lactating rats. Proceedings of the British Society of Animal Science: 11.

Normanton, H., Houdijk, J.G.M., Jessop, N.S., Knox, D.P. and Kyriazakis, I. (2005). The effect of changes in nutrient demand on gastrointestinal parasitism in lactating rats Proceedings of the British Society of Animal Science: 12.

Kyriazakis, I. and Houdijk, J.G.M. (2005). Immunonutrition: Nutritional control of parasites. Proceeding of the 6th International Sheep Veterinary Congress 73-75.

Wellock, I.J., Houdijk, J.G.M., Edwards, S.A., Wiseman, J., Gill, B.P., and Kyriazakis, I. (2005). Nutritional approaches to the challenge of antibiotic growth promoter withdrawal from weaned pigs. Society of Feed Technologists, Pig Performance 2006; 1-10.

Ketzis, J.K., Vercruysse, J., Stromberg, B., Larsen, M., Athanasiadou, S. and Houdijk, J.G.M. (2005). Establishing efficacy requirements for novel methods of controlling helminth infections in ruminants. Novel Approaches to the Control of Helminth Parasites of Livestock. Worm control or worm management: New paradigms in integrated control. pp. 8.

Houdijk, J.G.M., Kyriazakis, I., Huntley, J.F., Jackson, F., and Coop, R.L. (2005). Increased protein supply rapidly improves immunity to parasites in lactating ewes. Novel Approaches to the Control of Helminth Parasites of Livestock. Worm control or worm management: New paradigms in integrated control. pp. 30.

Houdijk, J.G.M., Kyriazakis, I. and Huntley, J.F. (2005). The nutritional cost of expression of immunity to gastrointestinal parasites. 20^th International Conference of the World Association for the Advancement of Veterinary Parasitology: 124.

Huntley, J.F., Houdijk, J.G.M., Kyriazakis, I., Stankiewicz, M. and Sykes, A. (2005). The effect of nutrition on the immune response to gastrointestinal nematode parasites. 20^th International Conference of the World Association for the Advancement of Veterinary Parasitology: 125.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2006). The effect of weaning age, feed crude protein level and experimental challenge with enterotoxigenic Escherichia coli on the health and performance of newly weaned pigs. Proceedings of the British Society of Animal Science: 27.

Wellock, I.J., Houdijk, J.G.M. and Kyriazakis, I. (2006). The effect of varying solubility and inclusion level of dietary non starch polysaccharides on the performance and risk of post weaning enteric disorders in newly weaned pigs. Proceedings of the British Society of Animal Science: 30.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2006). The effect of dietary protein supply on the health and performance of newly weaned pigs experimentally challenged with enterotoxigenic Escherichia coli. Proceedings of the British Society of Animal Science: 114.

Houdijk, J.G.M., Campbell, F.M., Fortomaris, P.D., Eckersall, P.D. and Kyriazakis, I. (2006). The acute phase protein response during sub-clinical post weaning colibacillosis in pigs depends on the level of dietary protein. Proceedings of the British Society of Animal Science: 71.

Normanton, H., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I. (2006). The effects of changes in protein supply and demand on gastrointestinal parasitism in lactating rats at a constant level of energy intake. Proceedings of the British Society of Animal Science: 107.

Zaralis, K., Tolkamp, B.J., Houdijk, J.G.M., Wylie, A.R.G. and Kyriazakis, I. (2006). Effects of parasitic infection on anorexia and leptin levels in lambs of two different breeds. Proceedings of the Nutrition Society 65: 73A.

Normanton, H., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I. Effects of changes in protein supply and demand on gastrointestinal parasitism in lactating rats. (2006). Proceedings of the Nutrition Society 65: 72A.

Houdijk, J.G.M. and Bünger, L. (2006). Selection for growth increases the penalty of parasitism on growth performance in mice. Proceedings of the Nutrition Society 65: 68A.

Houdijk, J.G.M., Normanton, H., Knox, D.P. and Kyriazakis, I. (2006). The nutritional basis of periparturient breakdown of immunity to gastrointestinal parasites in mammals. Proceedings of the 11th International Congress of Parasitology. CD-ROM.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2006).  Effects of weaning age, protein nutrition and enterotoxigenic Escherichia coli challenge on the health of newly weaned piglets. 10th International Symposium on Digestive Physiology in Pigs, Danish Institute of Agricultural Sciences, p 10.

Houdijk, J.G.M., Campbell, F.M., Fortomaris, P.D., Eckersall, P.D., and Kyriazakis, I. (2006).  Effects of sub-clinical post weaning colibacillosis and dietary protein on acute phase proteins in weaner pigs. 10th International Symposium on Digestive Physiology in Pigs, Danish Institute of Agricultural Sciences, p 24.

Wellock, I.J., Houdijk, J.G.M. and Kyriazakis, I. (2006).  Effects of dietary non-starch polysaccharide solubility and inclusion level on gut health and the risk of post weaning enteric disorders in newly weaned piglets. 10th International Symposium on Digestive Physiology in Pigs, Danish Institute of Agricultural Sciences, p 24.

Houdijk, J.G.M. (2006). Opportunities to reduce gastrointestinal parasitism through nutrition. Abstract book of the Scottish Animal Health and Welfare Conference 2006: p 10.

Houdijk, J.G.M., Versteegh, Q., Kyriazakis, I., Stenhouse, L., Jackson, F. and Coop, R.L. (2006). Protein supply to lactating ewes affects in vitro larval establishment of abomasal nematodes. Abstract book of the Scottish Animal Health and Welfare Conference 2006: p 36.

Wellock, I.J., Houdijk, J.G.M. and Kyriazakis, I. (2006).  Effects of dietary non-starch polysaccharide solubility and inclusion level on gut health and the risk of post weaning enteric disorders in newly weaned piglets. Abstract book of the Scottish Animal Health and Welfare Conference 2006: p 37-38.

Wellock, I.J., Fortomaris, P.D., Houdijk, J.G.M. and Kyriazakis, I. (2006). The effect of dietary protein supply on the health and performance of newly weaned pigs experimentally challenged with enterotoxigenic Escherichia coli. Abstract book of the Scottish Animal Health and Welfare Conference 2006: p 37.

Houdijk, J.G.M., Kyriazakis, I., Huntley, J.F., Jackson, F., and Coop, R.L. (2006). Increased protein supply rapidly improves immunity to parasites in lactating ewes. Abstract book of the Scottish Animal Health and Welfare Conference 2006: p 38.

Houdijk, J.G.M., Campbell, F.M., Fortomaris, P.D., Eckersall, P.D., and Kyriazakis, I. (2006).  Effects of sub-clinical post weaning colibacillosis and dietary protein on acute phase proteins in weaner pigs. Abstract book of the Scottish Animal Health and Welfare Conference 2006: p 39.

Houdijk, J.G.M. (2006). The consequences of nutrition on the host responses to gastrointestinal parasitism. Proceedings of the 14th XIV Brazilian Congress of Veterinary Parasitology and IIth Latin American Symposium of Rickettsioses: pp 98.

Wellock, I.J., Houdijk, J.G.M., Fortomaris, P.D., Edwards, S.A., and Kyriazakis, I. (2006). Too much of a good thing: protein, gut health and performance. The Pig Journal 57: 158-172.

Wellock, I.J., Houdijk, J.G.M., Skoufos, I., Fortomaris, P.D. and Kyriazakis, I. (2007). Is there a role for dietary fibre in the control of post-weaning colibacillosis in the newly weaned pig? The Pig Journal 59: 131-143.

Normanton, H., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I. (2007). Temporal effects of protein supply on the expression of immunity to Nippostrongylus brasiliensis during lactation in rats. Proceedings of the British Society of Animal Science: 93.

Houdijk, J.G.M. and Bünger, L. (2007). Interactive effects of selection for growth and protein supply on the consequences of gastrointestinal parasitism on growth performance in mice. Proceedings of the British Society of Animal Science: 92.

Zaralis, K., Tolkamp, B.J., Houdijk, J.G.M. and Kyriazakis, I. (2007). Effects of protein supplementation on anorexia and expression of immunity in parasitized periparturient ewes of two different breeds. Proceedings of the British Society of Animal Science: 94.

Zaralis, K., Tolkamp, B.J., Wylie, A.R.G., Houdijk, J.G.M. and Kyriazakis, I. (2007). Effects of secondary nematode infection on anorexia and leptin levels in growing lambs of two different breeds. Proceedings of the British Society of Animal Science: 91.

Wellock, I.J., Houdijk, J.G.M. and Kyriazakis, I. (2007). The interaction between protein content and inulin inclusion on the health and performance of weaned pigs exposed to an enterotoxigenic Escherichia coli challenge. Proceedings of the British Society of Animal Science: 105.

Wellock, I.J., Gill, P.B., Taylor, L., Miller, A. Houdijk, J.G.M. and Kyriazakis, I. (2007). The effect of protein level and diet quality on the performance of newly weaned pigs on a large scale facility. Proceedings of the British Society of Animal Science: 77.

Zaralis, K., Tolkamp, B.J., Houdijk, J.G.M. and Kyriazakis, I. (2007). Protein supplementation consequences on anorexia and expression of immunity in parasitized ewes of two breeds. 12th seminar of the FAO-CIHEAM Sub-network on Sheep and Goat Nutrition. Nutritional and Foraging Ecology of Sheep and Goats. (Eds Papachristou T.G. and Parissi, Z.M.); p 83.

Jones, L.A., Houdijk, J.G.M., Normanton, H., Knox, D.P. and Kyriazakis, I.  (2007). Nippostrongylus brasiliensis infection in the lactating rat: A model to assess nutritional sensitivity of periparturient breakdown of immunity.  Proceedings of the 21st International Conference of the World Association for the Advancement of Veterinary Parasitology; 310.

Houdijk, J.G.M. and Bunger, L. (2007). Interactive effects between growth potential and protein nutrition on resilience and resistance to parasites in mice. Proceedings of the 21st International Conference of the World Association for the Advancement of Veterinary Parasitology; 312.

Houdijk, J.G.M., Wellock, I.J., Miller, A., Miller, H.M., Edwards, S., Wiseman, J., Gill, B.P. and Kyriazakis, I. (2008). Effects of lactose inclusion level and inulin inclusion on performance of newly weaned pigs on a large scale facility. Proceedings of the British Society of Animal Science: 87.

Rooke, J., Friboulet, S., Dwyer, C., Houdijk, J.G.M. and Ashworth, C. (2008). Effects of prenatal undernutrition on lamb growth and gastrointestinal parasitism in two breeds of sheep. Proceedings of the British Society of Animal Science: 92.

Kidane, A., Athanasiadou, S., Houdijk, J.G.M., Tolkamp, B.J. and Kyriazakis, I. (2008). The interactive effects of maternal nutrition and subsequent grazing on bioactive forage on lamb performance and parasitic status. Proceedings of the British Society of Animal Science: 97.

Kidane, A., Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J. and Kyriazakis, I. (2008). Effects of periparturient metabolizable protein nutrition on ewes subjected to different infection pressure with the abomasal nematode Teladorsagia circumcincta. Proceedings of the British Society of Animal Science: 94.

Coltherd, J.C., Bünger, L., Kyriazakis, I. and Houdijk, J.GM. (2008). Effects of intrinsic growth ability and protein nutrition on ability to cope with pathogens in mice. Proceedings of the British Society of Animal Science: 99.

Jones, L.A., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I.  (2008). Nutritional sensitivity of periparturient immune responses to gastrointestinal parasites.  Easter Bush Research Consortium Launch; p. 39.

Coltherd, J.C., Bünger, L., Kyriazakis, I. and Houdijk, J.GM. (2008). Effects of growth potential and protein nutrition on ability to cope with parasites. Easter Bush Research Consortium Launch; p. 47

Coltherd, J.C., Bünger, L., Kyriazakis, I. and Houdijk, J.GM. (2008). Sensitivity of host resilience and resistance to Heligmosomoides bakeri infection pressure and protein nutrition. Proceedings of the Xth European Multicolloquium of Parasitology; p. 50.

Jones, L.A., Houdijk, J.G.M., Knox, D.P. and Kyriazakis, I.  (2008). Nutritional sensitivity of mucosal immune responses to Nippostrongylus brasiliensis in the lactating rat.  Immunology 125 (Suppl. 1): 120.

Kidane, A., Houdijk, J.G.M., Tolkamp, B.J., Athanasiadou, S. and Kyriazakis, I. (2009). Are Scottish Blackface ewes more resistant to nematode parasite infection than Greyface ewes? Proceedings of the British Society of Animal Science: 28.

Parissi, Z., Athanasiadou, S., Houdijk, J.G.M. and Kyriazakis, I. (2009). In vitro anthelmintic activity of chicory extracts at different vegetative stages on Teladorsagia circumcincta L3. Proceedings of the British Society of Animal Science: 35

Jones, L., Sakkas, P., Houdijk, J.G.M., Knox, D. and Kyriazakis, I. (2009). Nutritional manipulation of periparturient immunity to parasites. Abstract book British Society of Parasitology Spring and Maleria meeting 2009; 89.

Coltherd, J.C., Babayan, S., Bünger, L., Kyriazakis, I., Allen, J.E. and Houdijk, J.G.M. (2009). Effect of genetic growth potential and nutrition on immune response to Heligmosomoides bakeri infection. Abstract book British Society of Parasitology Spring and Maleria meeting 2009; 116.

Stephen, K.L., Tolkamp, B.J., Topp, C.F.E., Houdijk, J.G.M. and Kyriazakis, I. (2009). Environmental impacts of UK pig production systems: analysis using life cycle assessment. Aspects of Applied Biology 93: 33-40. 

Houdijk, J.G.M., Normanton, H., Knox, D.P. and Kyriazakis, I.  (2009). Effects of incremental protein supply on lactational performance and resistance to Nippostrongylus brasiliensis in lactating rats. Proceedings of the 22st International Conference of the World Association for the Advancement of Veterinary Parasitology; p. 15.

Houdijk, J.G.M., Jackson, F. and Kyriazakis, I.  (2009). Nutritional sensitivity of periparturient resistance to parasites in sheep may differ between parasite species. Proceedings of the 22st International Conference of the World Association for the Advancement of Veterinary Parasitology; p. 15.

Kidane, A., Houdijk, J.G.M., Tolkamp, B.J., Athanasiadou, S. and Kyriazakis, I. (2009). Interactive effects of protein nutrition and breed on periparturient immunity to parasites in sheep. Proceedings of the 22st International Conference of the World Association for the Advancement of Veterinary Parasitology; p. 71.

Kidane, A., Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J. and Kyriazakis, I. (2009). Consequences of ewe protein nutrition and grazing on chicory (Cichorium intybus) on animal performance and parasitism. Proceedings of the 22st International Conference of the World Association for the Advancement of Veterinary Parasitology; p. 16.

Rocha, R.A., Bricarello, P.A., Silva, M.B., Houdijk, J.G.M., Almeida, F.A. Cardia, D.F.F. and Amarante A.F.T. (2009). Influence of dietary protein supply on resistance to experimental infections with Haemonchus contortus in Ile de France and Santa Ines ewes around parturition and during lactation. Proceedings of the 22st International Conference of the World Association for the Advancement of Veterinary Parasitology; p. 166-167.

Bricarello, P.A., Rocha, R.A., Silva, M.B., Houdijk, J.G.M., Almeida, F.A. Cardia, D.F.F. and Amarante A.F.T. (2009). Effects of protein supply on immunological responses to Haemonchus contortus in Santa Ines and Ile de France ewes Proceedings of the 22st International Conference of the World Association for the Advancement of Veterinary Parasitology; p. 167.

Kidane A., Parissi, Z., Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J. and Kyriazakis, I. (2009). Chicory (Cichorium intybus) as promising bioactive forage for sheep production. In: Alternative Functions of Grassland. Proceedings of 14th European Grassland Federation Symposium, B. Cagaš, R. Macháč, J. Nedĕlník (eds). pp. 394-397.

Zaralis, K., Tolkamp, B.J., Houdijk, J.G.M. and Kyriazakis, I. (2009). Consequences of protein supplementation on anorexia and expression of immunity in two parasitized sheep breeds. In: Nutritional and foraging ecology of sheep and goats, Papachristou, T.G., Parissi, Z.M., Ben Salem, H., Morand-Fehr, P. (eds). Options Méditerranéenes, A 85: 419-423.

Jones, L., Sakkas, P., Houdijk, J.G.M., Knox, D. and Kyriazakis, I. (2009). Dissecting the effects of protein and energy nutrition on expression of immunity to gastrointestinal parasites during the periparturient period. European Journal of Immunology 39 (Suppl 1); p. S272.

Vipond, J.E., Matheson, S., Veldhuis, A. and Houdijk, J.G.M. (2009). Use of forage brassicas and bio-active chicory/plantain/clover mixtures for lamb finishing. Proceedings of the British Society of Animal Science: 45.

Kidane A., Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J. and Kyriazakis, I. (2009) Resistance to nematode parasites in Scottish Blackface ewes is less sensitive to protein scarcity than in Greyface ewes. 13th Seminar of the FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition; p. 71.

Zaralis, K., Tolkamp, B.J., Wyllie, A.R.G., Houdijk, J.G.M., Stear, M. and Kyriazakis (2009). Parasite-induced anorexia and its association with the immune response and plasma leptin concentrations in lambs of two genotypes. 13th Seminar of the FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition; p. 70.

Parissi, Z., Athanasiadou, S., Houdijk, J.G.M. and Kyriazakis, I. (2009). Comparison of the in vitro anthelmintic effects of five browsing woody species. 13th Seminar of the FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition; p. 73.

Coltherd, J.C., Babayan, S., Bünger, L., Kyriazakis, I., Allen, J.E. and Houdijk, J.G.M. (2009). Immune responses to macroparasites are sensitive to the interaction between genetic growth potential and protein nutrition in mice. Proceedings of the Nutrition Society 68: E101.

Sakkas, P., Jones, L.A., Houdijk, J.G.M., Knox, D. and Kyriazakis, I. (2009). Resistance to parasites in lactating rats is sensitive to protein but not energy supply. Proceedings of the Nutrition Society 68: E136.

Houdijk, J.G.M. (2009). Alternative to anthelmintics for the management of helminth parasites. Proceedings of the Sheep Veterinary Society 33, 73-76.

Athanasiadou, S., Jones, L.A., Burgess, S.T.G., Pemberton, A., Huntley, J.F. and Houdijk, J.G.M. (2010). Consequences of protein nutrition and parasite challenge on gene expression. Abstract book Association for Veterinary Teaching and Research Work; p 22.

Houdijk, J.G.M., Athanasiadou, Eckersall, P.D., Mellor, D.J., Courcier, E., Rogers, S., Girolami, M., Low, C.J. and Kyriazakis, I. (2010). Acute phase protein responses in sub-clinically infected pigs. Abstract book Association for Veterinary Teaching and Research Work; p 38.

Janowicz, A., Athanasiadou, S., Houdijk, J.G.M., Burchmore, R.J.S., Goodwin, R. and Eckersall, P.D. (2010). A proteomic investigation into the discovery of novel biomarkers for infection in pigs. Abstract book Association for Veterinary Teaching and Research Work; p 38.

Houdijk. J.G.M., Jones, L.A., Tolkamp, B.J., Athanasiadou, S. and Hutchings, M.R. (2010). Effect of maternal exposure to nematode parasites in ewes on performance and parasite resistance in their lambs. Advances in Animal Bioscience 1, 116.

Matheson, S.M., Dwyer, C.M., Bünger, L. and Houdijk, J.G.M. (2010). Interactions between neonatal lamb vigour and faecal soiling at weaning in three breeds of sheep. Advances in Animal Bioscience 1, 226.

Athanasiadou, S., Houdijk, J.G.M., Eckersall, P.D., Low, C.J. and Kyriazakis, I. (2010). Development of infection models so assess subclinical disease in pigs through the use of acute phase proteins as markers. Advances in Animal Bioscience 1, 119.

Sakkas, P., Jones, L.A., Houdijk. J.G.M., Knox, D.P. and Kyriazakis, I. (2010). Resistance to gastrointestinal nematodes during the periparturient period is sensitive to specific amino acid deficiency. Advances in Animal Bioscience 1, 117.

Kidane, A., Sakkas, P., Houdijk, J.G.M., Tolkamp, B.J., Athanasiadou, S. and I. Kyriazakis (2010). Nutritional sensitivity of correlations between estimated breeding values for faecal egg counts and resistance to parasites in periparutient ewes. Advances in Animal Bioscience 1, 5.

Houdijk, J.G.M., Nute, G.R., Navajas, E.A., Richardson, R.I. and Ross, D.W. (2010). Effect of chicory grazing on killing out percentage and meat eating quality in lambs. Advances in Animal Bioscience 1, 135.

Sakkas, P., Jones, L.A., Houdijk. J.G.M., Knox, D.P. and Kyriazakis, I. (2010). Improved nutritional status rapidly increases resistance to parasites in lactating mammals. Proceedings of the 12th International Congress of Parasitology. Abstract 1835.

Sakkas, P., Jones, L.A., Houdijk. J.G.M., Knox, D.P. and Kyriazakis, I. (2010). Differential effects of protein and energy supply on resistance to parasites in lactating mammals. Proceedings of the 12th International Congress of Parasitology. Abstract 1836.

Sakkas, P., Jones, L.A., Houdijk. J.G.M., Knox, D.P. and Kyriazakis, I. (2010). Amino acid deficiencies penalize immunity towards parasites in lactating mammals. Proceedings of the 12th International Congress of Parasitology. Abstract 1837.

Sakkas, P., Houdijk. J.G.M., Athanasiadou, S. and Kyriazakis, I. (2010). Use of European grown protein sources to control gastrointestinal parasitism in small ruminants. 61^st Annual Meeting of the European Association for Animal Production; p. 199.

Houdijk, J.G.M., Athanasiadou, S., Eckersall, P.D., Mellor, D.J., Rogers, S., Girolami, M., Low, C.J. and Kyriazakis, I. (2010). Acute phase proteins as an indicator for sub-clinical disease in young pigs. Proceedings of the 8^th European Colloquium on Acute Phase Proteins; p. 50-57.

Saleem, G., Sparks, N., Pirzgoliev, V., Acamovic, T., Houdijk. J.G.M., Wiseman, J., Peron, A. and Snape, J. (2010). Effect of wheat cultivar, type and xylanase supplementation on growth and gut microflora of broilers. World’s Poultry Science Journal 66 (Supplement): 375.

Smith, L.A., Houdijk, J.G.M. and Kyriazakis, I. (2011). The Green Pig survey: constraints of using peas and faba beans in growing and finishing pig diets. Advances in Animal Bioscience 2, 98.

Houdijk, J.G.M., Baker, A., Navajas, E.A., Richardson, R.I. and Ross, D.W. (2011). Finishing lambs on chicory increases killing out percentage and carcass conformation score without detrimental effects on sensory meat eating quality. Advances in Animal Bioscience 2, 139.

Sakkas, P., Houdijk, J.G.M., Athanasiadou, S. and Kyriazakis, I. (2011). Consequences of plant protein source on the periparturient resistance to parasites in ewes. Advances in Animal Bioscience 2, 121.

Athanasiadou, S., Houdijk, J.G.M., Eckersall, P.D., Low, C.L. and Kyriazakis, I. (2011). Acute phase proteins as markers for subclinical disease in young pigs. Advances in Animal Bioscience 2, 109.

Saleem, G., Sparks, N., Houdijk, J.G.M. and Pirgozliev, V. (2011). Experimental induction of sub-clinical Necrotic Enteritis in broiler chickens. British Poultry Abstracts 7: 58-59.

Saleem, G., Sparks, N., Houdijk, J.G.M., Acamovic, T. and Pirgozliev, V. (2011). Does feed withdrawal assist experimental induction of sub-clinical necrotic enteritis in broiler chickens? British Poultry Abstracts 7: 4-5.

Sakkas, P., Houdijk, J.G.M., Athanasiadou, S. and Kyriazakis, I. (2011). Effect of plant protein source on periparturient resistance to parasites in ewes. Proceedings of the 23^rd International Conference of the World Association for the Advancement of Veterinary Parasitology: p. 41.

Houdijk, J.G.M. and Van Vuure, C.A. (2012). Effects of spray-dried porcine plasma on weaner pig performance and resilience to sub-clinical post weaning colibacillosis. Advances in Animal Bioscience 3, 49.

Houdijk, J.G.M., Van Deun, L., Van Vuure, C.A. 2012. Spray-dried porcine plasma improves weaner pig resilience to enteric challenge. In: Alternatives to Antibiotics Symposium: Challenges and Solutions in Animal Production, Abstract 2.9.

Topp, C.E.F., Houdijk, J.G.M., Tarsitano, D., Tolkamp, B.J. and Kyriazakis, I. (2012). Quantifying the environmental benefits of using home grown protein sources as alternatives to soyabean meal in pig production through life cycle assessment. Advances in Animal Bioscience 3, 15.

Smith, L.A., Houdijk, J.G.M. and Kyriazakis, I. (2012). Effects of increasing dietary inclusion levels of peas and faba beans to replace soybean meal on pig growth performance. Advances in Animal Bioscience 3, 63.

Smith, L.A., Houdijk, J.G.M., Homer, D. and Kyriazakis, I. (2012). Effects of increasing dietary inclusion levels of peas and faba beans to replace soybean meal on carcass quality in pigs. Advances in Animal Bioscience 3, 23.

White, G., Wiseman, J., Smith, L.A., Houdijk, J.G.M. and Kyriazakis, I. (2012). Nutritional value of diets for growing / finishing pigs containing high levels of home grown legumes compared with one based on soyabean meal 1. Growth performance. Advances in Animal Bioscience 3, 52.

White, G., Wiseman, J., Smith, L.A., Houdijk, J.G.M. and Kyriazakis, I. (2012). Nutritional value of diets for growing / finishing pigs containing high levels of home grown legumes compared with one based on soyabean meal 2. Carcass quality. Advances in Animal Bioscience 3, 24.

Craigie, C., Ross, D.W., Richardson, R.I., Malton, C., Roehe, R., Morris, S. and Houdijk, J.G.M. (2012). Diet and gender effects on meat quality. Advances in Animal Bioscience 3, 22.

Houdijk, J.G.M., Tolkamp, B.J., Rooke, J.A. and Hutchings, M.R. (2012). Gastrointestinal parasitism per se has no effect on methane output by lactating ewes. Advances in Animal Bioscience 3, 12.

Ricci, P., Chagunda, M.G.G., Duthie, C.-A., Houdijk, JG.M., Roehe, R. and Waterhouse, A. (2012). Methane emissions from ruminants: towards a better understanding of outputs from the Laser Methane Detector. 29th Biennial Conference of the Australian Society of Animal Production, Lincoln, New Zealand, p 42.

Saleem, G., Sparks, N., Pirzgoliev, V. and Houdijk. J.G.M. (2012). Interactive effects of diet composition and litter quality on growth performance and incidence of sub-clinical necrotic enteritis in broiler chickens. British Poultry Abstracts 8, 7-9.

Athanasiadou, S., Terry, S., Tolera, A., Debela, E., Tolossa, K., Connelley, T., Burgess, S. and Houdijk, J.G.M. (2013). In vitro validation of the antiparasitic properties of medicinal Ethiopian plant extracts. Advances in Animal Bioscience 4, 46.

Athanasiadou, S., Debela, E., Tolera, A., Tolossa, K., Terry, S., Houdijk, J.G.M. (2013). In vitro validation of the anthelmintic properties of Ethiopian medicinal plant extracts. Proceedings of the 24th International Conference of the World Association for the Advancement of Veterinary Parasitology: 615.

Athanasiadou, S., Debela, E., Tolera, A., Debela, E., Tolossa, K., Burgess S., Connelley, T., Terry, S. and Houdijk, J.G.M. (2013). In vitro validation of Ethiopian medicinal plant extracts against ticks and mites. Proceedings of the 24th International Conference of the World Association for the Advancement of Veterinary Parasitology: 475.

Houdijk, J.G.M. (2013). Protein and energy scarcity have different effects on resistance to nematode parasites. 50^th Annual Meeting of the Brazilian Society of Animal Science.

Houdijk, J.G.M., Tolkamp, B.J. and Hutchings, M.R. (2013). Total tract digestibility is reduced in anorexic parasitized ewes. Proceedings of the 24th International Conference of the World Association for the Advancement of Veterinary Parasitology: 409.

Tolossa, K., Debela, E., Athanasiadou, S., Tolera, A. and Houdijk J.G.M. (2013). Assessment of ethno-medicinal plants used for treatment of livestock ailments by traditional healers in southern Ethiopia. Proceedings of the 24th International Conference of the World Association for the Advancement of Veterinary Parasitology: 630-631.

Tolossa, K., Debela, E., Athanasiadou, S., Tolera, A., Ganga, G. and Houdijk, J.G.M. (2013). Ethno-medicinal study of plants used for treatment of human and livestock ailments by traditional healers in South Omo, Southern Ethiopia. Proceedings of the First Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia. pp 7-26.

Houdijk, J.G.M., Smith, L.A., Davis, A., Penlington, N., Hazzledine, M., Barker, M. and Kyriazakis, I. (2013). Large-scale demonstration of using peas and faba beans as home grown alternatives to soya bean meal in grower and finisher pig diets. Advances in Animal Biosciences 4, 89.

Ricci, P., Duthie, C.-A., Hyslop, J.J., Houdijk, J.G.M., Roehe, R. Rooke, J.A. and Waterhouse, A. (2013). Methane from ewes and steers measured with the Laser Methane Detector correlates with open-circuit respiration chamber measurements. 5th Greenhouse Gases and Animal Agriculture Conference, Vol 4 (2), p. 548.

Houdijk, J.G.M. and Vipond, J.E. (2014). Home-grown alternatives for by-pass soya bean meal. Advances in Animal Biosciences 5, 17.

Houdijk, J.G.M. (2014). Benefit of by-pass based protein supplementation on periparturient ewe performance. Advances in Animal Biosciences 5, 30.

Houdijk, J.G.M., Smith, L.A., Pollock, J., Pelser, J. and van Vuure, C.A. (2014). Spray-dried porcine plasma products improve performance of enterotoxigenic Escherichia colichallenged weaner pigs. Advances in Animal Biosciences 5, 119.

Houdijk, J.G.M. and Olukosi, O., (2014). Feeding value of bean starch concentrates for growing pigs. Advances in Animal Biosciences 5, 135.

Ptochos, S., Athanasiadou, S., Hutchings, M.R. and Houdijk, J.G.M. (2014). Impact of environmental temperature on in vitro establishment rate of Teladorsagia circumcincta. Advances in Animal Biosciences 5, 155.

Athanasiadou, S., Debela, E., Regassa, A., Tolera, A., Nurfeta, A., Tolossa, K., Terry, S. and Houdijk, J.G.M. (2014). Anthelmintic Ethiopian medicinal plants for small ruminants: in vitro and in vivo studies. Proceedings of the 13^th International Conference for Parasitology; A2187.

Athanasiadou, S., Tolera, A., Debela, E., Tolossa, K., Terry, S., Regassa, A., Nurfeta, A. and Houdijk, J.G.M. (2014). In vivo validation of the antiparasitic properties of medicinal plants. Advances in Animal Biosciences 5, 156.

Nurfeta, A., Tolera, A., Debela, E., Regassa, A., Athanasiadou, S., Tolossa, K., Bokore, T., Banerjee, S. and Houdijk, J.G.M. (2014). Evaluation of anthelmintic properties of Itacha (Dodonea angustifolia) leaves in goats. Proceedings of the 13^th International Conference for Parasitology; A2746.

Athanasiadou, S., Debela, E., Tolera, A., Tolossa, K., Burgess, S., Terry, S. and Houdijk, J.G.M. (2014). Validation of acaricidal activity of medicinal plants: in vitro and in vivo studies. Proceedings of the 2^nd European Conference in Small Ruminant Health Management, London, UK (in press).

Athanasiadou, S., Debela, E., Tolera, A., Tolossa, K., Terry, S. and Houdijk, J.G.M. In vitro testing of Ethiopian medicinal plant extracts against endoparasites. Proceedings of the Second Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia (in press).

Athanasiadou, S., Debela, E., Tolera, A., Tolossa, K., Terry, S. and Houdijk, J.G.M. In vivo testing of Ethiopian medicinal plant extracts against endoparasites in mice and sheep. Proceedings of the Second Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia (in press).

Athanasiadou, S., Debela, E., Tolera, A., Tolossa, K., Burgess, S., Connelley, T., Terry, S. and Houdijk, J.G.M. In vitro and in vivo testing of Ethiopian medicinal plant extracts against ectoparasites. Proceedings of the Second Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia (in press).

Debela, E., Athanasiadou, S., Regassa, A., Gebre, S., Tolera, A., Nurfeta, A., Terry, S. and Houdijk, J.G.M. In vitro validation of some Ethiopian extracts against two tick species (B. decoloratus & A. variegatum). Proceedings of the Second Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia (in press).

Debela, E., Regassa, A., Athanasiadou, S., Tolera, A., Nurfeta, A., Gebre, S., Terry, S. and Houdijk, J.G.M. In vivo validation of six Ethiopian plant preparations against lice species (Damalina ovis & Linogatus vituli) of sheep at farmers condition in Debre Berhan, North Shewa, Ethiopia. Proceedings of the Second Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia (in press).

Nurfeta, A., Banerjee, S., Tolera, A., Debela, E., Regassa, A., Athanasiadou, S., Tolossa, K., Bokore, T. and Houdijk, J.G.M. Evaluation of anthelmintic properties of Ittacha for goats fed a basal diet of grass hay. Proceedings of the Second Workshop ‘Identification, investigation and implementation of plant based parasite control strategies’. Compiled by Nurfeta, A and Regassa A. Hawassa University, Ethiopia (in press).

Houdijk, J.G.M. and Bowdridge, S. (2014). Can protein supplementation reduce anthelmintic use? Proceedings of the 13^th International Conference for Parasitology; A1396.

Houdijk, J.G.M., Tolkamp, B.J., Rooke, J. A. and Hutchings, M.R. (2014). Periparturient parasitism impacts on methane production. Proceedings of the 13^th International Conference for Parasitology; A2662.

Ptochos, S., Athanasiadou, S., Spanos, G., Hutchings, M.R. and Houdijk, J.G.M. (2014). Environmental change impacts on hatching of ovine gastrointestinal nematodes. Proceedings of the 13th International Conference for Parasitology; A2377.

Pollock, J., Gally, D., Tiwari, R., Hutchings, M.R. and Houdijk, J.G.M. (2015). Development of a 16S rRNA metabarcoding method to study the porcine gut microbiota. Proceedings of the Annual Conference of the Society for General Microbiology; p31.

Tolossa, K., Fry, S.C., Athanasiadou, S., Loake, G.J. and Houdijk, J.G.M. (2015). Physico-chemical study and anti-parasitic properties of aqueous Cissus ruspolii and Adenia sp. extracts. Advances in Animal Biosciences 6, 72.

Athanasiadou, S., Debela E., Tolera, A., Tolossa, K., Burgess, S.T.G., Terry, S. and Houdijk, J.G.M. (2015). Validation of acaricidal activity of medicinal plants: in vitro and in vivo studies. Advances in Animal Biosciences 6, 73.

Masuda, A., Allen, J.E., Houdijk, J.G.M. and Athanasiadou, S. (2015). The consequences of protein supplementation during gestation on performance and immune parameters in mammals. Advances in Animal Biosciences 6, 90.

Tolossa, K., Fry, S.C., Athanasiadou, S., Loake, G.J. and Houdijk, J.G.M. (2015). In vitro screening of anti-parasitic properties of four Ethiopian medicinal plant extracts. Advances in Animal Biosciences 6, 92.

Pollock, J., Gally, D., Tiwari, R., Hutchings, M.R. and Houdijk, J.G.M. (2015). Intestinal adhesion and faecal shedding of enterotoxigenic Escherichia coli in experimentally challenged weaned pigs. Advances in Animal Biosciences 6, 93.

Tolossa, K., Fry, S.C., Athanasiadou, S., Loake, G.J. and Houdijk, J.G.M. (2015). Bio-assay guided fractionation of crude aqueous extracts of Cissus ruspolii and Adenia sp. Advances in Animal Biosciences 6, 94.

Houdijk, J.G.M., Smith, L.A. and Vipond, J.E. (2015). By-pass based protein supplementation and periparturient ewe performance. Advances in Animal Biosciences 6, 162.

Smith, L.A., Balduino Gonçalves dos Reis, M., Olukosi, O and Houdijk, J.G.M. (2015). Bean starch concentrates as home grown alternative to soya bean meal in grower and finisher pig diets. Advances in Animal Biosciences 6, 173.

Olukosi, O.A., Kasprzak M., Kightley S., Wiseman J., Carre, P. and Houdijk, J.G.M. (2015). Metabolisable energy of oilseed rape meal is dependent on its gross energy and protein content. Advances in Animal Biosciences 6, 213.

Houdijk, J.G.M., Tolkamp, B.J., Rooke, J.A. and Hutchings, M.R. (2015). Periparturient parasitism increases ewe methane production per kilogram lamb weaned. Advances in Animal Biosciences 6, 258.

Ptochos, S., Athanasiadou, S., Haskell, M., Hutchings, M.R. and Houdijk, J.G.M. (2015). Impact of early parasitic gastroenteritis and elevated environmental temperature on growth performance of lambs. Advances in Animal Biosciences 6, 260.

Masuda, A., Allen, J.E., Houdijk, J.G.M. and Athanasiadou, S. (2015). Nutritional regulation of resistance to Nippostrongylus brasiliensis re-infection in lactating rats. Proceedings of the Nutrition Society 74, E199.

Masuda, A., Allen, J., Houdijk, J.G.M. and Athanasiadou, S. 2015. Dietary protein supplementation regulates Type 2 immune response in parasitized lactating rats. 25^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp 95.

Houdijk, J.G.M., Athanasiadou, S., Tolkamp, B.J., Rooke, J. and Hutchings, M.R. 2015. Periparturient parasitism increases the environmental footprint of lamb production. 25^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp 166.

Tolossa, K., Fry, S.C., Athanasiadou, S., Loake, G.J. and Houdijk, J.G.M. 2015. Bioassay-guided purification of anti-parasitic compounds from indigenous Ethiopian medicinal plants. 25^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp 174.

Athanasiadou, S., Regassa, A., Debela E., Tolossa, K., Nurfeta A., Tolera, A. and Houdijk, J.G.M. 2015. In vitro and in vivo validation of bioactive plants for parasite control. 25^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp 199.

Ptochos, S., Haskell, M., Houdijk, J.G.M., Hutchings, M.R. and Athanasiadou, S. 2015. Impact of elevated environmental temperature on early parasitic gastroenteritis of sheep. 25^th International Conference of the World Association for the Advancement of Veterinary Parasitology: pp 494.

Tolossa, K., Fry, S.C., Athanasiadou, S., Loake, G.J. and Houdijk, J.G.M. 2015. Bioassay-guided fractionation of aqueous plant extracts with anti-parasitic activity. 15th International Congress of the International Society for Ethno-Pharmacology: pp 38.

Tolossa, K., Fry, S.C., Athanasiadou, S., Loake, G.J. and Houdijk, J.G.M. 2016. Bioassay-guided isolation and purification of phytochemicals with anti-parasitic properties from Cissus ruspolii. Proceedings of the Nutrition Society 75, E49.

Houdijk, J.G.M., Van der Heiden, A., Trienes, Y. and Vipond, J.E. 2016. Interactive effects of by-pass protein supplementation and parasitism on ewe performance. Advances in Animal Biosciences 7, 18.

Pollock, J., Gally, D.L., Glendinning, L., Tiwari, R., Hutchings, M.R. and Houdijk, J.G.M. 2016. 16S rRNA gene sequencing reveals temporal shifts in the porcine faecal microbiota post-weaning, independent of enterotoxigenic Escherichia coli challenge. Advances in Animal Biosciences 7, 97.

Wilkinson, R.G. and Houdijk, J.G.M. 2016. Should we feed more metabolisable protein to pregnant and lactating ewes? Advances in Animal Biosciences 7, 164.

Houdijk, J.G.M., et al. Ewes and GHG EAAP

Houdijk, J.G.M., Kightley, S.P.J., Kasprzak, M., Wiseman, J., Carre P. and Olukosi, O.A. 2016. Home grown rapeseed meal as soya bean meal alternative for grower and finisher pigs. 67^th Abstract book European Association of Animal Production, 226.

Houdijk, J.G.M., Van der Heiden, A., Trienes, Y. and Vipond, J.E. 2017. Sensitivity of β-hydroxy-butyrate to blood sample type, by-pass protein nutrition and parasitism. Advances in Animal Biosciences 8, 93.

Khattak, F., Williams, S., Mahdavi, J. and Houdijk, J.G.M. 2017. Efficacy of TYPLEX^TM chelate in broilers with natural Campylobacter challenge. British Poultry Abstracts 13, 6-7.

Walker, R., Watson C., Baddeley J., Olukosi, O. and Houdijk, J.G.M. 2018. Protein crop options for Scotland with potential for more than one end-use. Aspects of Applied Biology 138, 93-97.

Galgano, S., Kettle, H., Free, A., Olukosi, O. and Houdijk, J.G.M. 2018. Dynamic modelling of the core microbiota in the porcine gut. Advances in Animal Biosciences 9, 39.

Houdijk, J.G.M. and Roehe, R. 2019. Sensitivity of growth performance and crude protein conversion ratio of finisher pigs to dietary protein and essential amino acids. Advances in Animal Biosciences 10, 39.

Hussein, M. A., Khattak, F., Vervelde, L., Athanasiadou, S., & Houdijk, J. G. M. 2020. Sensitivity of resilience to amino acid nutrition: reassessing the ideal protein concept? British Poultry Abstracts 15, 15-16.

Houdijk, J.G.M. and Khattak, F. 2019. Phytogenic benefits on growth performance on clean and re-used litter for broilers British Poultry Abstracts 15, 22-23.

Khattak, F., Kanbur, G. and Houdijk, J.G.M. 2019. Re-used litter impacts on post-hatch broiler performance, litter quality and caecal morphology. British Poultry Abstracts 15, 40-41.

Houdijk, J.G.M. and Roehe, R. 2020. Sensitivity of weight gain composition and N excretion of finisher pigs to dietary protein and essential amino acids. Advances in Animal Bioscience 11, 115.

Galgano, S., Kettle, H., Free, A. and Houdijk, J.G.M. 2020. Dynamic modelling of pig gut microbiota. Advances in Animal Bioscience 11, 66.

Houdijk, J.G.M. and Walker, R.L. 2020. Does inclusion of faba bean in starter diets allow for greater use of faba beans in grower and finisher diets for broilers? British Poultry Abstracts 16, 18-19.

Hussein, M. A., Khattak, F., Vervelde, L., Athanasiadou, S., & Houdijk, J. G. M. 2020. Sensitivity of broiler performance to reused litter exposure and amino acids supplementation. British Poultry Abstracts 16, 19-20.

Hussein, M. A., Khattak, F., Vervelde, L., Athanasiadou, S., & Houdijk, J. G. M. (2020) Effects of threonine, arginine and glutamine supplementation on caecal microbiome profiles and litter characteristics of broilers exposed to reused litter. British Poultry Abstracts 16, 15-16.

Houdijk, J.G.M. and Walker, R.L. 2021. The use of faba beans as an alternative protein source to soya bean meal in grower and finisher broiler rations is independent of starter feed form and in-feed coccidiostat. British Poultry Abstracts 17, 12-13.

Houdijk, J.G.M., Black, K., Barnett, A., Walker, G. and Iannetta, P.P.M. 2021. Standardised ileal digestibility of amino acids from spent barley-bean for broilers. British Poultry Abstracts 17, 11-12.

Galgano, S., Mistry, D., Di Maggio, F., Farthing, K., Dalby, N., Fellows, A and Houdijk, J.G.M. 2021. Peracetic acid precursors for non-antibiotic modulation of gut microbiota and possible modulation of performance in broilers. British Poultry Abstracts 17, 18-19.

Khattak, F., Pedersen, N.R., Mattiesen, R. And Houdijk, J.G.M. 2021. Lacto-fermented rapeseed meal additive: a nutritional intervention to reduce Campylobacter jejuni colonisation and improve performance in broilers. British Poultry Abstracts 17, 7-8.

Hussein, M.A., Khattak, F., Vervelde, L., Athanasiadou, S. And Houdijk, J.G.M. 2021. Effect of amino acid supplementation in reduced crude protein diets on growth performance and gut health indices of broiler chickens exposed to sub-clinical enteric health challenges. British Poultry Abstracts 17, 13-14.

Tolossa, K., Athanasiadou, S., Fry, S.C. and Houdijk, J.G.M. 2021. Ethiopian medicinal plants have in vivo anti-parasitic activity. Animal – Science Proceedings 12, 96.

Hussein, M.A., Khattak, F., Vervelde, L., Athanasiadou, S. and Houdijk, J.G.M. 2021. Physicochemical and microbial profiling of poultry litter over time post-harvest. Proceedings of the 26th World’s Poultry Congress, 129.

Houdijk, J.G.M., Eising, I., Olukosi, O.A., Lopez-Ulibarri, R., Khattak, F. and Perez-Calvo, E. 2021. Evaluation of dietary supplementation of a novel muramidase to wheat-soya diets on broiler production efficiency in the presence of feed enzymes and coccidiostat. Proceedings of the 26th World’s Poultry Congress, 280.

Fakeer, A. and Houdijk, J.G.M. 2021. Effect of eugenol supplementation on broiler performance, litter moisture and foot pad dermatitis. Poultry Science 100 (E-Supplement 1), 7.

Hussein, M.A., Khattak, F., Vervelde, L., Athanasiadou, S. and Houdijk, J.G.M. 2021. Effect of amino acid supplementation to reduced crude protein diets on growth performance, organ weights and nutrient digestibility of broiler chickens exposed to sub-clinical enteric health challenges. Poultry Science 100 (E-Supplement 1), 65-66.

Houdijk, J.G.M., Bentley, J.S., Walker, R.L. and Dixon, L.M. 2022. Interactive effects of breed and faba bean feeding on broiler performance. British Poultry Abstracts 18, 11.

Houdijk, J.G.M., Hussein, M.A., Walker, R.L. and Khattak, F. 2022. Sensitivity of dry matter, ash and crude protein apparent ileal digestibility to starter feed form, grower and finisher inclusion of faba beans and stunning method in male broilers. British Poultry Abstracts 18, 18.

Galgano, S., Conway, L. Dalby, N., Fellows, A. and Houdijk, J.G.M. 2022. In-feed peracetic acid precursor nanoparticles improve reused litter exposed broilers performance. British Poultry Abstracts 18, 16.

Houdijk, J.G.M., Galgano, S., Hussein, M.A., Richmond, A., Bentley, J.S. and Dixon, L.M., 2023. Reused litter and faba beans impact on growth and caecal microbiome in slow growing broilers. British Poultry Abstracts 19 (in press).

Khattak, F., Jlali, M., Rougier, T., Houdijk, J.G.M. and Hincelin, C., 2023. Bacterial 6-phytase supplementation can help improve bone mineralisation, phosphorus digestibility and growth performance of broilers fed corn-soyabean meal-based diet. British Poultry Abstracts 19 (in press).

Galgano, S., Conway, L., Dalby, N., Fellows, A. and Houdijk, J.G.M., 2023. Broiler gut microbiota responses to peracetic acid precursors. British Poultry Abstracts 19 (in press).

Bone, G., Houdijk, J.G.M., Lopez-Franco, Y., Ceballos-Bernal, C., Castro-Castro, A., Soto-Luzania, X., Fernadez Baurista, K., Mancera, Gonzalez, O., Brameld, J., Elmes, M., Parr, T. and Gonzalez-Carranza, Z., 2023. Differential sensitivity to processed Mezquite from two areas of Mexico on broiler chicken performance. Animal Science Proceedings 14, 302-303.

Houdijk, J.G.M., Ianetta, P.P.M., Houseman, R. and Baird, R., 2023. Dehulled faba beans for weaner pigs. Animal Science Proceedings 14, 355-356.

Galgano, S., Conway, L., Fellows, A. and Houdijk, J.G.M., 2023. Peracetic acid to replace zinc oxide, modulating microbiota to control pig post-weaning diarrhoea. Animal Science Proceedings 14, 361-362.

Galgano, S., Khattak, F. and Houdijk, J.G.M., 2024. Differential gene expression elucidating Campylobacter jejuni perseverance mechanisms after storage at ultra-low temperature. . British Poultry Abstracts 20, 13-14.

Houdijk, J.G.M., Walker, R.L. and Dixon, L.M., 2024. Production efficiency and animal welfare trade-off: breed, faba beans and broiler locomotion. British Poultry Abstracts 20, 4-5

Houdijk, J.G.M., Marchal, L., Bello, A., Gibbs, K. and Dersjant-Li, Y., 2024. Complete replacement of soya products with alternative ingredients for fast growing broilers. British Poultry Abstracts 20, 20-21.

Khattak, F., Yang, C.J., Sharma, R., Houdijk, J.G.M., and Powell W., 2024. Precision feeding insights into nutritional composition, non-starch polysaccharides and apparent metabolisable energy of elite and synthetic lines of wheat in poultry. British Poultry Abstracts 20, 9-10.

Sandilands, V., Khattak, F., and Houdijk, J.G.M., 2024. Does feeding sprouted barley to laying hens affect feed intake, egg production and egg quality? British Poultry Abstracts 20, 28.

Houdijk, J.G.M., Hussein, M.A., Davies, D.R., Smith, L.C. and McArthur, W.J., 2024. Nutritional value and soya replacement potential of dehulled faba beans for poultry. Proceedings of the European Society of Veterinary Comparative Nutrition 28, 131.

Galgano, S., Umar Faruk, M., Eising, I., Houdijk. J.G.M. and Khattak, F. 2025. Microbiota and microbiome impacts on nutrient utilisation in layer hens administered muramidase. British Poultry Abstracts 21, 3-4.

Galgano, S., Hanford, T., Sutton, K. and Houdijk, J.G.M. 2025. Development of a sub-clinical avian colibacillosis model. British Poultry Abstracts 21, 11-12.

Hussein, M.A., Davies, D.R., Smith, L.C., McArthur, J.W. and Houdijk. J.G.M. 2025. Nutritional value of processed faba beans for broiler chickens. British Poultry Abstracts 21, 12-13.

Saleem, G., Houdijk, J.G.M., Sparks, N. and Athanasiadou. S. 2025. Effect of Clostridium perfringens challenge on jejunal gene expression in broiler chickens. British Poultry Abstracts 21, 20.

Galgano, S., Hussein, M.A., Magee, K., Gratacap, R. and Houdijk, J.G.M., 2025. Replacing fishmeal for farmed marine protein in starter broiler rations improves digestibility through microbiota modulation. British Poultry Abstracts 21, 22.

Hussein, M.A., Galgano, S., Magee, K. Gratacap, R. and Houdijk, J.G.M., 2025. Replacing fishmeal for farmed marine protein in starter broiler rations safely improves growth performance. British Poultry Abstracts 21, 21.

Houdijk, J.G.M., Hussein, M.A., Davies, D.R., Smith, L.C., Hertogs, K., Vandaele, I., Pauwelyn, S., Van Wesemael, D. and McArthur, W.J., 2025. Rumen degradability and intestinal digestibility of toasted faba beans. Animal Science Proceedings 16, 85-86.

Houdijk, J.G.M., Khattak, F., Park, E., Begerano, E., Assaraf, M., 2026. Multi-nutrient polyhalite supplementation improves broiler performance and carcass traits. British Poultry Abstracts 22, 15-16.

Khattak, F., Mkrtchyan, H.V., Smallman, D., Estridge, P., Galgano, S., Allen, M.J., Taylor, B., Short, F., Sutcliffe, M. and Houdijk, J.G.M., 2026. Dietary dulse as a partial wheat replacer in finisher broilers impacts nutrient digestibility, carcass yield, and long-chain omega-3 enrichment in breast muscle. British Poultry Abstracts 22, 16-17.

Khattak, F., Pedersen, N.R., Schepens, R., Sorensen, P., Galgano, S. and Houdijk, J.G.M., 2026. Lacto-fermented feed blend enhances broiler performance, gut fermentation and reduces Campylobacter colonisation. British Poultry Abstracts 22, 18.

Houdijk. J.G.M., Hussein, M.A., Kenyon, B.P., Davies, D.R., Smith, L.C. and McArthur, W.J., 2026. Total replacement of soya bean meal with whole, dehulled or dehulled-toasted faba beans in early laying hens impacts on egg production and egg quality. British Poultry Abstracts 22, 20-21.

Hussein, M.A., Kenyon, B.P., Davies, D.R., Smith, L.C., McArthur, W.J. and Houdijk. J.G.M., 2026. Effect of partial replacement of soya bean meal with whole, dehulled and toasted faba beans on growth performance, carbon footprint and feed cost of broiler chickens. British Poultry Abstracts 22, 21-22.

Galgano, S., Weingart, C., Hart, K.J. and Houdijk, J.G.M., 2026. Lanolin, a green solution to replace soya oil in broiler rations. British Poultry Abstracts 22, 22-23.

Hussein, M.A., Galgano, S., Magee, K., Gratacap, R. and Houdijk, J.G.M., 2026. Artemia meal as a sustainable fishmeal alternative in starter diets promotes early growth and immune organ development in broilers. British Poultry Abstracts 22, 24-25.

Houdijk, J.G.H., Bellarby, O., Iannetta, P., Houseman, R. and Baird, R., 2026. Dehulled faba bean impacts on ileal digestibility in weaner pigs. Animal Science Proceedings 17 (in press).

Galgano, S., Aliki, H., Irving, E., Sharma, R., Powell, W. and Houdijk, J.G.M., 2026. Purslane supplementation improves nitrogen digestibility and enriches caecal probiotic genera in young broilers. Animal Science Proceedings 17 (in press).

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