... RPGremained constant, regardless of the level of residualpolygenic variance. Figure 2 shows the influence of the sires’ EBV on the DGV of validation bulls. The R2values of the regression of DGV on ... sires in the referencepopulation, were regressed on the conventional EBV of their 580 sires that were also included in the genomicreference population. The correspon ding R2values indi-cate the ... polygeniceffect increased to 20% of the total genetic variance, the R2valuebetweentheDGVofthesonandtheEBVof the sire dropped below 0.20. In contrast to DGV, corre-sponding R2values for the sum of DGV...