Resumen
- The objectives of this study were to estimate the proportion of additive genetic and phenotypic variances explained by the SNP markers in the Illumina3K chip for 4 postweaning ultrasound carcass and weight traits, to compare rankings of calf predicted additive genetic values with 3 models, and to evaluate trends of calf predictions as Brahman fraction increased from 0 to 1. Traits were postweaning ultrasound measures of ribeye area (UREA), backfat thickness (UFAT), intramuscular fat (UPIMF), and body weight at time of ultrasound (UW). Models were genomic-polygenic, genomic, and polygenic.