Projects per year
Personal profile
Research interests
I am a dairy nutrition scientist with experience in the international feed industry, working to connect science and practice.
My interests are:
- Mammary physiology: rate of synthesis of milk protein, fat and lactose
- Intemediary metabolism: the pathways of nutrients after absorption
- Rumen physiology: digesting plant cell walls, building protein
- Methane and manure: the other products of the system
- Understanding feedstuffs: where the nutrients are
- Calf development and growth: growing better cows
Projects
- Optimising amino acid nutrition in periparturient dairy cows. EastBio Doctoral Training Programme, award date Apr 21
- Halogenated compounds in seaweed – A new market opportunity for the UK seaweed industry. £50,000. Centre for the Environment, Fisheries and Aquaculture Science, Apr 21–Jul 21.
- Evaluation of a methane mitigating feed additive in dairy calves. Commercial contract, £124,992. Apr 21-Mar22
- Methane-inhibiting livestock feed supplements: review of net impacts, barriers to success and consumer acceptance. DEFRA, £70,768. Feb 21-Aug 21
- Scoping Study on the Opportunities and Barriers of Improved Forages for Livestock Sustainability and Productivity. DEFRA, £12,548. Feb 21–Sep 21.
- Commercial Livestock Research. Commercial contract, £24,000. Jul 20-Jul 21
Supervision
- PhD supervisor. Optimising amino acid nutrition in the periparturient cow. SRUC/University of Edinburgh, from Oct 21
- PhD supervisor. Nitrate as a mitigator of enteric methane production. University of New England, Australia. Oct 13-Oct 17
- PhD advisor. Novel approaches to improving calf health: new technology and data analytics. University of Edinburgh. Oct 20-
- PhD advisor. Fatty acid nutrition of high-yielding dairy cows. Michigan State University, USA. Oct 20-
- PhD advisor. Effects of energy source and amino acids on milk synthesis in the dairy cow. University of Wisconsin, Aug 21
Education/Academic qualification
PhD, Protein nutrition of intensively reared cattle, University of Nottingham
1 Oct 1982 → 30 Jun 1987
Award Date: 21 Jul 1987
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Collaborations and top research areas from the last five years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
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FeedCirc: Support for Arla Feed Utilisation project ('FeedCirc')
Dewhurst, R. (PI), Newbold, J. (PI) & Campbell, C. (PI)
1/04/26 → 30/09/26
Project: Research
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Feeding and Funding Low Emission Dairy: Developing Novel English-Grown Faba Bean Feeds and a Carbon Insetting Mechanism to Monetise Emissions Reductions for Farmers
Newbold, J. (PI), Houdijk, J. (CoI) & Nisbet, H. (Researcher)
1/12/25 → 30/11/28
Project: Research
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Phytomining for Cobalt: Exploring Plant-Based Solutions for Sustainable Dairy Cow Nutrition
Novo, L. (PI) & Newbold, J. (CoI)
1/11/25 → 31/10/27
Project: Research
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Sustainable Dairy Pathways : Sustainable Dairy Pathways Project
Dewhurst, R. (CoPI), Newbold, J. (PI) & March, M. (Researcher)
1/08/25 → 31/07/27
Project: Research
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Optimising the plasma treatment of slurry
Newbold, J. (PI) & Hargreaves, P. (CoI)
1/01/25 → 31/12/26
Project: Research
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Advancing methane mitigation in ruminants through feed additive combinations: efficacy, interactions, and implementation challenges
Ramos-Morales, E., Palma-Hidalgo, J. M., Newbold, J. R., Pardo, Z., Yañez-Ruiz, D. R. & Newbold, C. J., 15 Apr 2026, (First published) In: Frontiers in Microbiology. 17, 1683471.Research output: Contribution to journal › Review article › peer-review
Open AccessFile1 Link opens in a new tab Citation (Scopus)20 Downloads (Pure) -
Development and use of methane-inhibiting feed supplements in dairy farming
Newbold, J., 10 Mar 2026, Achieving net zero dairy farming. Burleigh Dodds Science Publishing, p. 227-250 24 p. (Burleigh Dodds Series in Agricultural Science).Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review
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Feed additives for methane mitigation: Regulatory frameworks and scientific evidence requirements for the authorization of feed additives to mitigate ruminant methane emissions
Tricarico, J. M., Garcia, F., Bannink, A., Lee, S.-S., Miguel, M. A., Newbold, J. R., Rosenstein, P. K., Van der Saag, M. R. & Yáñez-Ruiz, D. R., Jan 2025, In: Journal of Dairy Science. 108, 1, p. 395-410 16 p.Research output: Contribution to journal › Review article › peer-review
Open AccessFile15 Link opens in a new tab Citations (Scopus)131 Downloads (Pure) -
In vitro rumen degradation, fermentation, and methane production of four agro-industrial protein-rich co-products, compared with soyabean meal
Christodoulou, C., Kliem, K. E., Auffret, M. D., Humphries, D. J., Newbold, J. R., Davison, N., Crompton, L., Dhanoa, M. S., Smith, L. & Stergiadis, S., Jan 2025, In: Animal Feed Science and Technology. 319, 116151.Research output: Contribution to journal › Article › peer-review
Open AccessFile14 Link opens in a new tab Citations (Scopus)45 Downloads (Pure) -
Nutrient use and methane emissions in growing beef fed different protein sources and a pasture-based diet
Christodoulou, C., Kliem, K. E., Auffret, M. D., Humphries, D. J., Kirton, P., Jalal, H., Newbold, J. R., Davison, N., Smith, L. G. & Stergiadis, S., 17 Jan 2025, (First published) In: Journal of Animal Science. 103, skaf007.Research output: Contribution to journal › Article › peer-review
Open AccessFile3 Link opens in a new tab Citations (Scopus)52 Downloads (Pure)
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Healthy liver leads to healthier transition
Newbold, J. (Speaker)
24 Feb 2022Activity: Talk, evidence or presentation types › Invited talk
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Scottish Dairy Growth Board workshop - moving towards net zero carbon emissions
Newbold, J. (Speaker) & Bell, J. (Speaker)
20 Jan 2022Activity: Talk, evidence or presentation types › Oral presentation
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Amino acid balancing for high grass/grass silage diets
Newbold, J. (Speaker)
25 Feb 2021Activity: Talk, evidence or presentation types › Invited talk
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Methane inhibitors
Newbold, J. (Speaker)
25 Nov 2021Activity: Talk, evidence or presentation types › Invited talk
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The importance of dairy protein for healthy aging
Newbold, J. (Speaker)
31 May 2021Activity: Talk, evidence or presentation types › Invited talk
Press/Media
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COP26 round table discussion (podcast)
Newbold, J., Rees, B., Reed, M., McCracken, D., Lindsay, P., Fischer-Moller, M. & Thomson, S.
23/09/21
1 Media contribution
Press/Media