Institute of Animal Science, Prague 10, CZ 104 01, Czech Republic.
Meat Sci. 2011 Dec;89(4):444-50. doi: 10.1016/j.meatsci.2011.05.007. Epub 2011 May 19.
The objective of the study was to investigate the effects of sex and slaughter age on the fatty acid (FA) composition and stearoyl-CoA desaturase gene expression in muscle and adipose tissue. Twenty-four Charolais × Simmental crossbred bulls and heifers were raised under similar conditions and slaughtered at 14 or 18 months of age. The total amount of FA in muscle increased markedly in older animals with higher contents of monounsaturated FA (MUFA) in heifers than bulls. The proportions of MUFA and desaturation indices were higher in heifers, whereas polyunsaturated FA were higher in bulls in both muscle and subcutaneous adipose tissue. The results of this study demonstrated sex-dependent differences in the FA composition of muscle and subcutaneous adipose tissue from cattle slaughtered at different ages. The expression of the stearoyl-CoA desaturase gene was higher in the adipose tissue of heifers compared to bulls, and its variation partly contributed to sex- and age-differences in the FA composition of bovine adipose tissue.
本研究旨在探讨性别和屠宰年龄对肌肉和脂肪组织中脂肪酸（FA）组成和硬脂酰辅酶 A 去饱和酶基因表达的影响。24 头夏洛莱×西门塔尔杂交公牛和小母牛在相似条件下饲养，并在 14 或 18 个月时屠宰。随着动物年龄的增长，肌肉中的 FA 总量显著增加，小母牛的单不饱和脂肪酸（MUFA）含量高于公牛。MUFA 和饱和度指数在小母牛中的比例较高，而多不饱和脂肪酸在公牛中的比例较高，无论是在肌肉还是皮下脂肪组织中都是如此。本研究结果表明，在不同年龄屠宰的牛的肌肉和皮下脂肪组织的 FA 组成存在性别依赖性差异。与公牛相比，硬脂酰辅酶 A 去饱和酶基因在小母牛的脂肪组织中的表达更高，其变化部分导致了牛脂肪组织 FA 组成的性别和年龄差异。
