Optimizing design of breeding programs
نویسنده
چکیده
Beef cattle breeders are increasingly being offered gene marker tests for important traits in the breeding objective. They must make an economically rational decision whether to use these tests. Besides a potential immediate effect in seedstock sales, gene marker tests will affect the genetic improvement rate in the population. To examine the returns in a multi-trait breeding objective a pseudo-BLUP selection index was developed to predict selection response using information from both phenotypic and molecular sources. Three objectives were examined each with a significantly different economic value for the meat quality trait marbling score and consequently profitability from investment in a gene marker test for a marble score influenced by the economic value and size of the gene effect. Of the three objectives, targeting longand short-fed export and a high quality domestic market, only the long-fed export objective had a suitably high economic value to justify investment in genotype information. Increases in selection response above a non-genotyping strategy were 14%, 4% and 0.7%, for the three objectives. An advantage in using a gene marker test is the ability to select sires earlier when not much phenotypic information has been collected. Consequently, the proportion of young bulls used for breeding was important in the model. The improvements in accuracy of selection of young bulls lead to a significant change in the optimal age structure. This led to a decrease in the generation interval and contributed to the increase in annual selection response.
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