Unusual susceptibility of sheep selected for resistance to internal parasites

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

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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.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 20 May 2011 01:25
Last Modified: 04 Mar 2018 23:31
Uncontrolled Keywords: parasitic infection; nematodes; selective breeding; lambs
Fields of Research : 07 Agricultural and Veterinary Sciences > 0702 Animal Production > 070202 Animal Growth and Development
06 Biological Sciences > 0606 Physiology > 060603 Animal Physiology - Systems
07 Agricultural and Veterinary Sciences > 0707 Veterinary Sciences > 070708 Veterinary Parasitology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
URI: http://eprints.usq.edu.au/id/eprint/7709

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