Gastrointestinal nematode infection in sheep is a relatively well-understood host-parasite interaction. Usually, the presence of infection can be diagnosed by nematode eggs in the faeces. There is also a need to identify relatively susceptible animals for selective anthelmintic treatment or culling. A variety of indicator traits and genetic markers exist. The purpose of this article is to discuss the advantages and disadvantages of each method, especially in relation to natural, predominantly Teladorsagia circumcincta infection. 

J. Buitkamp, Stephen C Bishop, M. J Stear

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 13, , 13.04, 2002
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