There have been no reports of improved production in sheep selected (within breed) for worm resistance when they are under similar worm challenge to unselected sheep. In some instances, it appears that the productivity of genetically resistant sheep is compromised by selection for worm resistance (Morris et al., 2000). Why do we not see the expected advantage (Sykes, 1994) in resistant sheep of having a lower worm burden? This experiment examines the relationship between liveweight gain and faecal egg count at regular intervals in young sheep over the course of 10 months in two flocks bred for resistance to internal parasites.

S. J Eady

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 13, , 13.05, 2002
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