Unusual susceptibility of sheep selected for resistance to internal parasites

Paper

Gray, G. D., Gill, H. S., Kauter, K. G., Burgess, S. K. and Douglas-Hill, A.. 1994. "Unusual susceptibility of sheep selected for resistance to internal parasites." 5th World Congress on Genetics Applied to Livestock Production. Guelph, Canada 15 Sep 1994 Canada.
Paper/Presentation Title

Unusual susceptibility of sheep selected for resistance to internal parasites

Presentation TypePaper
AuthorsGray, G. D. (Author), Gill, H. S. (Author), Kauter, K. G. (Author), Burgess, S. K. (Author) and Douglas-Hill, A. (Author)
Journal or Proceedings TitleProceedings of the 5th World Congress on Genetics Applied to Livestock Production
Journal Citation18, pp. 285-288
Number of Pages4
Year1994
Place of PublicationCanada
Conference/Event5th World Congress on Genetics Applied to Livestock Production
Event Details
5th World Congress on Genetics Applied to Livestock Production
Event Date
15 Sep 1994
Event Location
Guelph, Canada
Abstract

Two experiments were conducted to investigate the expression of genetic resistance to gastrointestinal nematodes infections of sheep. Merino lambs of parasite- resistant and random-bred genetic background were infected with nematodes of the genera Trichostrongylus and Haemonchus. In both experiments, and contrary to expectation, some groups of genetically resistant lambs had higher faecal egg counts than their random-bred counterparts. These unusual findings may be explained by the high levels of infection to which the lambs were exposed. Although these results are restricted to lambs in one family derived from a single highly resistant ram, we suggest that interactions between genotype and the level and nature of exposure to nematode infection require further investigation.

Keywordsparasitic infection; nematodes; selective breeding; lambs
ANZSRC Field of Research 2020300301. Animal growth and development
310910. Animal physiology - systems
300909. Veterinary parasitology
Byline AffiliationsNo affiliation
University of New England
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