A paternal half-sib family of purebred Angus cattle was used to examine the associated effects of six marker loci on growth and carcass traits. Among 146 half-siblings, offspring that inherited the paternal BGKOxYjA’0 ' B blood group system phenogroup had 9.1 kg heavier 205-day (weaning) and 17.3 kg heavier 365-day (yearling) weights than half-sibs that inherited the alternative paternal B system phenogroup l2Y2E',Y’
(P< .05). Steers that inherited the BGKO.YjA’O’ phenogroup also had significantly leaner carcasses (-2.6 mm fat thickness at the 12th rib) than sibs that inherited l2Y2E’,Y’. A highly significant association between BoLA-A and rib-eye area in steers was found (P<.001). The four other genetic systems, RBC-C, F-V, Tf and Gc, had no significant effect on growth or carcass traits (P>.05). These results indicate that the B blood group and BoLA systems are linked to genes that affect preweaning growth and lean muscle content, respectively
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 117–120, 1990
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