Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

A region on bovine chromosome 15 influences beef longissimus tenderness in steers.

Abstract

Warner-Bratzler shear force was determined at 2 and 14 days post mortem for steaks from 294 steers and heifers, progeny of a Brahman Ă— Hereford bull and Hereford, American Angus and crossbred cows. Cattle were slaughtered on 4 dates in 1995. 94 cattle with extreme shear force measurements were genotyped using 196 microsatellite DNA markers spanning 29 autosomal bovine chromosomes. One QTL (quantitative trait locus) was identified, located 28 cM (95% confidence interval, 17 to 40 cM) from the most centromeric marker on BTA15. The difference in shear force of steaks aged for 14 days between progeny with the Brahman allele and those with the Hereford allele was 1.19 phenotypic standard deviations (26% of phenotypic variance) for one slaughter group and was not significant for the 3 other groups. It is suggested that unknown environmental factors present for 3 of the 4 slaughter groups were capable of masking the effect of this QTL.