Weight gain and resistance to gastrointestinal nematode infections in two genetically diverse groups of cattle

J Hoglund*, A Hessle, K Zaralis, K Arvidsson-Segerkvist, S Athanasiadou

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Citations (Scopus)
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Abstract

Body weight gain (BWG) and gastrointestinal nematode challenge (GIN) were investigated in two genetically diverse groups of cattle. Thirty-two dairy calves (D = Swedish Red/Holstein) and 31 dairy × beef crosses (C = Swedish Red/Holstein × Charolais) pairwise matched by dam breed and birth dates, were monitored for ≈20 weeks on a pasture grazed by cattle in the previous year. At turn-out, animals (between 6 and 12 months age) from each genotype were either infected with 5000 third stage (L3) Ostertagia ostertagi (50%) and Cooperia oncophora (50%) larvae (H, high-exposure); or treated monthly with 0.5 mg ivermectin (Noromectin®, Pour-on) per kg bodyweight to remove worms ingested (L, low-exposure). Animals were weighed every fortnight and individual BWG was calculated. Faecal and blood samples were collected every four weeks throughout the experiment for nematode faecal egg counts (FEC) and larvae cultures and serum pepsinogen concentrations (SPC), respectively. Nematode eggs were observed 29 days post turn-out in both H groups. FEC peaked to around 200 eggs per gram (epg) on days 58 and 85 respectively in both H groups. FEC were also observed in the L groups at the same time, but mean epg remained very low (<20 epg) and constituted exclusively of C. oncophora. Although, there was no significant difference in SPC values in animals of the different genotypes, ten animals of CH showed a SPC >3.5 IU tyrosine whereas only six DH animals reached similar pepsinogen levels. The level of infection (H and L) significantly affected BWG in both genotypes. Even though there was no statistically significant genotype (C or D) × treatment (H or L) interaction, there was a larger difference in body weight of H and L in C (37 kg) compared to D (17 kg) genotypes at the end of the experiment. Our data collectively support the view crossbred (C) animals experience the impact of gastrointestinal parasitism more severely compared to pure dairy (D) first season grazers. The mechanisms that underpin this remains speculative.
Original languageEnglish
Pages (from-to)88 - 91
Number of pages4
JournalVeterinary Parasitology
Volume249
DOIs
Publication statusPrint publication - 24 Nov 2017

Bibliographical note

1029977

Keywords

  • Beef cattle
  • Cattle genetics
  • Cooperia oncophora
  • Crossbreeding
  • Dairy
  • Growth performance
  • Nematodes
  • Ostertagia ostertagi
  • Parasite resilience
  • Parasite resistance

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