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Meat quality traits were unaffected by a quantitative trait locus affecting leg composition traits in Texel sheep¹

P. L. Johnson^*,2, J. C. McEwan, K. G. Dodds, R. W. Purchas and H. T. Blair^*

^* Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand; and AgResearch Invermay, Mosgiel, New Zealand; and and Institute of Food, Nutrition, and Human Health, Massey University, Palmerston North, New Zealand

² Correspondence: Private Bag 11 222 (phone: 64-6-350-4525; fax: 64-6-350-5636; e-mail: P.L.Johnson{at}massey.ac.nz).

A QTL affecting leg muscle and fat traits has been identified within the New Zealand Texel population. The QTL maps to a region on OAR 2 with a two-marker haplotype test established at markers BULGE20 and BM81124. These markers encompass the likely position of Growth Differentiation Factor 8 (GDF8). The pleiotropic effects of this QTL on meat quality traits are tested. Objective measures of meat quality including pH, color (L*, a*, and b*), and tenderness (as assessed by Warner-Bratzler shear force measurements) were assessed on longissimus and semi-membranosus muscles of 540 progeny from six Texel sires. Four of these sires were subsequently identified as segregating for leg muscle and fat traits. For these segregating sires, comparison of progeny that had inherited the favorable haplotype from their sire with those that had received the alternate haplotype revealed no significant differences in the meat quality traits assessed. This finding suggests that the muscling QTL does not have pleiotropic effects on meat quality. A general scan for meat quality QTL was carried out using genotype data for eight markers from FCB128 to RM356 flanking 122cM of OAR 2 using Haley-Knott regression. This analysis revealed two QTL for a single sire. A QTL detected in the region of Marker INRA40 for color L* mapped to a site close to the muscling QTL, but there was evidence to suggest it is at a distinct locus. The QTL in the region of Marker RM356 might map distal to Marker RM356, as no peak was observed. This QTL, which seems to affect pH, color a*, color b*, and Warner-Bratzler shear measurements, requires further characterization.

Key Words: Carcass Trait • Growth Differentiation Factor 8 • Lamb • Meat Quality • Quantitative Trait Loci • Texel

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