A desired gains approach was used to investigate the effect of placing varying emphasis on worm resistance in a Merino breeding objective. The sensitivity of predicted genetic gain was examined using two sets of assumed parameters and a range of desired gains for worm resistance. The outcome of assuming zero genetic correlations between production traits and faecal egg count (FEC), in a population where the best available estimates are the true parameters, was to under-estimate response in production and to change substantially the contribution of reproductive rate to the production index. Genetic change in FEC was overestimated, particularly when the desired gain specified for FEC was low.

S. J Eady

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 141–144, 1998
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