Fig. 4
From: Optimizing genomic reference populations to improve crossbred performance
Genetic trend (a) and trend in genetic variance (b) in the nucleus population with direct selection for purebred (PB) performance. Genetic trend is based on average true breeding value (TBV) across generations for purebred and crossbred (CB) performance, for two levels of the correlation between purebred and crossbred performance (\({r}_{pc}\)). Direct selection is on purebred performance, with parameters for crossbred performance changing indirectly as a result of \({r}_{pc}\)