Genomic quality prediction must account for breed-specific signals

Genomic selection in beef cattle cannot simply be transferred from one breed to another. A study published on 28 October in the Journal of Animal Science examined genomic associations with eye-muscle area and intramuscular fat in two purebred populations—Angus and Hereford—and three crossbred populations: Brangus, Santa Gertrudis and Speckle Park.

The dataset was substantial: phenotypic and genomic records from more than 66,000 bulls and more than 56,000 heifers were analysed for eye-muscle area, while more than 65,000 bulls and 54,000 heifers were included for intramuscular fat. The authors identified associated regions shared across several populations, but also breed-specific signals. They link these differences, among other factors, to differing allele frequencies and linkage-disequilibrium patterns.

The result is not a promise of a simple universal prediction tool. Instead, it indicates that multi-breed evaluation systems should combine shared markers with population-specific weighting. This matters particularly for quality traits: marbling and muscular development are not merely breeding targets; they influence carcass value and the eating experience of the final product.