We studied the effect of including genotyped cows in the reference population of the Nordic Red Dairy Cattle on the validation accuracy of genomic breeding values. Deregressed individual cow EBVs (DRP) were used in single-step genomic evaluations. The accuracy of evaluations was calculated after including 0 or 3,111 or 5,593 genotyped cows in the reference population. All evaluations used 4,188 genotyped bulls in the reference. The gain in accuracy was as less than expected, varying from 0.8% to 2.6%-units for the production traits. Still, genotyping cows and subsequent inclusion in the reference population is advantageous and should be increased.

Minna Koivula, Ismo Strandén, Gert P Aamand, Esa A Mäntysaari

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Selection using molecular information, , 083, 2014
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