J Anim Sci. 2017 Dec;95(12):5184-5196. doi: 10.2527/jas2017.1966.
Bivariate animal models were used to estimate phenotypic and genetic correlations between 9 carcass merit and meat tenderness traits with 25 individual and grouped fatty acids in the subcutaneous adipose tissue of a population of 1,366 Canadian beef cattle finishing heifers and steers. In general, phenotypic correlations were low (<0.25 in magnitude) except for moderate phenotypic correlations of 9-17:1 (-0.29 ± 0.16), 18:0 (0.26 ± 0.14), 11-18:1 (-0.33 ± 0.15), 11-18:1 (0.35 ± 0.14) with Warner-Bratzler shear force measured 3 d postmortem and between 14:0 (-0.36 ± 0.1), 9-14:1 (-0.34 ± 0.08), 9-16:1 (-0.36 ± 0.08), 9-18:1 (0.26 ± 0.07), and sum of branched-chain fatty acids (BCFA; -0.27 ± 0.06) and back fat thickness (BFAT). Genetic correlations were also low for most of the traits. However, moderate to moderately high genetic correlations (0.25 to 0.50 in magnitude) were detected for some traits, including 17:0 (0.4 ± 0.11), 18:0 (0.44 ± 0.12), 9-14:1 (-0.47 ± 0.11), 9-16:1 (-0.43 ± 0.11), and the -6:-3 PUFA ratio (-0.5 ± 0.15) with HCW; 9-14:1 (-0.41 ± 0.13) and 9-16:1 (-0.42 ± 0.13) with BFAT; 17:0 (0.43 ± 0.19) and BCFA (0.45 ± 0.19) with lean meat yield; 13-18:1 (0.40 ± 0.15) with carcass marbling score; sum of CLA (0.45 ± 0.22), 18:2-6 (0.47 ± 0.17), and sum of PUFA (0.48 ± 0.17) with overall tenderness measured 3 d postmortem; the -6:-3 PUFA ratio (0.41 ± 0.22) and sum of CLA (0.42 ± 0.25) with overall tenderness measured 29 d postmortem; and BCFA (0.41 ± 0.27) with Warner-Bratzler shear force measured 29 d postmortem. The genetic correlations observed in this study suggest that contents of some fatty acids in beef tissue and carcass merit and meat tenderness traits are likely influenced by a subset of the same genes in beef cattle. Due to some antagonistic genetic correlations, multiple-trait economic indexes are recommended when fatty acid composition, carcass merit, and meat tenderness traits are included in the breeding objective.
使用双变量动物模型估计了加拿大肉牛育肥母牛和阉牛群体中 25 种个体和组脂肪酸与 9 个胴体肉质和肉嫩度性状之间的表型和遗传相关性。一般来说，表型相关性较低（幅度小于 0.25），除了 9-17:1（-0.29±0.16）、18:0（0.26±0.14）、11-18:1（-0.33±0.15）、11-18:1（0.35±0.14）与死后 3 天的 Warner-Bratzler 剪切力之间存在中度表型相关性，以及 14:0（-0.36±0.1）、9-14:1（-0.34±0.08）、9-16:1（-0.36±0.08）、9-18:1（0.26±0.07）和支链脂肪酸（BCFA；-0.27±0.06）和背膘厚度（BFAT）之间存在中度表型相关性。大多数性状的遗传相关性也较低。然而，一些性状的遗传相关性为中度至中度高度（幅度为 0.25 至 0.50），包括 17:0（0.4±0.11）、18:0（0.44±0.12）、9-14:1（-0.47±0.11）、9-16:1（-0.43±0.11）和 -6:-3PUFA 比值（-0.5±0.15）与 HCW；9-14:1（-0.41±0.13）和 9-16:1（-0.42±0.13）与 BFAT；17:0（0.43±0.19）和 BCFA（0.45±0.19）与瘦肉产量；13-18:1（0.40±0.15）与胴体大理石花纹评分；CLA 总和（0.45±0.22）、18:2-6（0.47±0.17）和 PUFA 总和（0.48±0.17）与死后 3 天整体嫩度测量；-6:-3PUFA 比值（0.41±0.22）和 CLA 总和（0.42±0.25）与死后 29 天整体嫩度测量；以及 BCFA（0.41±0.27）与死后 29 天 Warner-Bratzler 剪切力测量。本研究观察到的遗传相关性表明，牛肉组织和胴体肉质和肉嫩度性状中的一些脂肪酸含量可能受到肉牛中同一组基因的子集的影响。由于一些拮抗遗传相关性，建议在脂肪酸组成、胴体肉质和肉嫩度性状包含在育种目标中时，使用多性状经济指数。
