WLR B4F Gen Pred - Impact of preselection in genomic evaluations

Project: PhD

Project Details


The development of genomic evaluation models over the last two decades has resulted in more accurate estimation of breeding values of animals, compared to when only pedigree-based genetic evaluation models were used. In large animal breeding programs, selection of parents of the next generation usually takes place in multiple stages. The initial stages of selecting parents of the next generation are collectively called preselection. Preselection takes place when selection candidates are young, sometimes even before they have records for any breeding goal trait. As the selection candidates grow older, they generally get records for more breeding goal traits, and they are re-evaluated in subsequent evaluations to select the final set of parents of the next generation. Impact of preselection on accuracy and bias of subsequent pedigree-based evaluation is well-known, but this is not the case for subsequent genomic evaluation. Role of genotypes from preculled animals, i.e. animals removed from the breeding program at preselection stage, in subsequent genomic evaluation of their preselected sibs is also poorly understood. This project investigated the impact of preselection on accuracy and bias in subsequent genomic evaluation of preselected animals, using single-step genomic best linear unbiased prediction (ssGBLUP) as the representative genomic evaluation model.
Effective start/end date1/02/1825/05/22


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