Abstract
With the widespread adoption of genotyping by Angus breeders, the American Angus Association has now more than one million animals genotyped. Genomic evaluations are conducted weekly with singlestep genomic BLUP (ssGBLUP) using the algorithm for proven and young (APY). A set of high accuracy core animals has been used since the implementation of ssGBLUP in 2017. We investigated changes in genomic EBV (GEBV) and convergence behavior with different sets of core animals. Data from the routine growth genetic evaluation were used, and GEBV from different sets of core animals were compared with the original set defined in 2017. The rank correlation of breeding values was ≥0.99, and the number of rounds was 57% smaller with an updated random core set. Maximum changes in breeding values were at most 1.31 genetic standard deviations of the traits investigated. The core animals in the official evaluations were successfully updated in May of 2021.
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