Abstract

Because of linkage and variation in heterozygosity, individuals differ in the Mendelian sampling variance on their gametes. Thus some parents produce genetically more variable offspring than others. With genomic EBV and phased genotypes, these differences can be quantified and potentially used to increase genetic gain. Here we show that genetic gain and the probability of breeding a top-ranking individual can be increased by selecting individuals on an index of their GEBV and the standard deviation on the GEBV of their gametes (SDGEBV). The optimum index was , where is the standardized truncation point belonging to the selected proportion p. Compared to selection on ordinary GEBV, in dairy cattle the probability of breeding a top-ranking individual can be increased by 36%, and response to selection by 3.6% when selection is strong (p = 0.001). Preselection on GEBV facilitates implementation with little loss of gain. Keywords: response to selection, Mendelian sampling, GEBV, genetic gain

Piter Bijma, Yvonne CJ Wientjes, Mario PL Calus

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Gain - Breeding Strategies 2, , 47, 2018
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