Associations between genetic markers and growth and carcass traits in a paternal half-sib family of Angus cattle.

摘要: Segregation of polymorphic marker genes in a paternal half-sib family Angus cattle was used to detect associations between genetic markers and quantitative traits. The selected (n = 146) had sire that heterozygous at six loci; BoLA-A (class I major histocompatibility complex), B, C F blood group systems, serum transferrin vitamin D binding protein. alleles fit the expected ratios for all loci. Performance data analyzed half-sibs included birth, 205-d 365-d adjusted weights pre- post-weaning average daily gains. Carcass steers 61) carcass weight, rib-eye area, 12th rib fat thickness, percent kidney, heart pelvic yield grade. Least squares means were compared differences performance traits groups inherited alternative alleles. Significant effects found two systems. Half-sibs chromosomal segment (CS) marked by RBC-B system BGKOxY2A'O' phenogroup heavier (9.1 kg) (17.3 weights, faster preweaning gains (.04 less thickness (-2.6 mm) than sibs CS I2Y2E'1Y'. Also, BoLA-w2 allele larger areas (4.1 cm2) BoLA-w28. These indicate probable presence linked BoLA systems affect growth lean muscle content.