Genomic-Polygenic and Polygenic Evaluation of Multibreed Angus-Brahman Cattle for Direct and Maternal Growth Traits Under Subtropical Conditions

Synopsis High rank correlations existed between estimated breeding value for birth weight direct, weaning weight direct, postweaning gain direct, birth weight maternal, and weaning weight maternal from a genomicpolygenic model that used all phenotypic, pedigree, and genotypic information and a polygenic model. Variance components and genetic parameters from these two models were similar for all traits. Incomplete pedigree or lack of it resulted in lower rank correlations and poor estimates of genetic parameters particularly for maternal traits. Thus, to maximize the benefits of genotyping, commercial producers would need to keep complete pedigree records as well as individual animal phenotypes.