home    about    browse    search    latest    help 
Login | Create Account

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

Downloads

Downloads per month over past year

View more statistics



Höglund, Johan (2017) Weight gain and resistance to gastrointestinal nematode infections in two genetically diverse groups of cattle. Veterinary Parasitology, 249, pp. 88-91.

[img]
Preview
PDF - English
376kB

Summary

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 sig- nificant 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.


EPrint Type:Journal paper
Subjects: Animal husbandry
Animal husbandry > Health and welfare
Research affiliation: European Union > CORE Organic Plus > PrOPara
Sweden > Swedish University of Agricultural Sciences (SLU) > Department of Biomedical Sciences and Veterinary Public Health
ISSN:0304-4017
DOI:10.1016/j.vetpar.2017.11.011
Deposited By: Höglund, Prof Johan
ID Code:33708
Deposited On:03 Sep 2018 05:48
Last Modified:16 Oct 2018 06:31
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

Repository Staff Only: item control page