Departamento de Producción Animal, Centro de Investigaciones Agrarias de Mabegondo (C.I.A.M), INGACAL, Apdo 10, 15080 A Coruña, Spain.
Meat Sci. 2014 Feb;96(2 Pt A):829-36. doi: 10.1016/j.meatsci.2013.09.027. Epub 2013 Oct 10.
The fatty acid (FA) composition of longisimus dorsi (LD) and subcutaneous fat (SCF) from Rubia Gallega (RG) calves was compared for three dietary oil sources (linseed, LO; sunflower, SFO or soybean, SYO). Oils were added (4.5%) to a commercial concentrate and no differences on animal performance, carcass characteristics or meat quality among diets were noted. Total n-3 polyunsaturated FA (PUFA) increased in LD and SCF when feeding LO diet (P<0.001). The trans(t) FA profiles were dominated by t11-18:1, except when feeding SFO diet, where ∑t6- to t10-18:1 exceeded t11-18:1 leading the highest (∑t6-to t10-18:1)/t11-18:11 ratio in LD (P<0.05). The overall changes in n-3 PUFA and t18:1 when feeding LO and SYO could be viewed as positive for human health, but quantitatively it was apparent that most dietary PUFA were completely biohydrogenated. Inhibiting PUFA biohydrogenation will be an important next step to improve the FA composition of RG cattle.
对拉古纳罗萨（Rubia Gallega，RG）小牛背最长肌（LD）和皮下脂肪（SCF）的脂肪酸（FA）组成进行了比较，比较了三种膳食油源（亚麻籽油、LO；葵花籽油、SFO 或大豆油、SYO）。在商业浓缩饲料中添加 4.5%的油，但在动物性能、胴体特征或肉质方面，不同饮食之间没有差异。当饲喂 LO 饮食时，LD 和 SCF 中的总 n-3 多不饱和脂肪酸（PUFA）增加（P<0.001）。反式（t）FA 图谱主要由 t11-18:1 主导，除了饲喂 SFO 饮食时，∑t6-至 t10-18:1 超过 t11-18:1，导致 LD 中最高的（∑t6-至 t10-18:1）/t11-18:11 比值（P<0.05）。饲喂 LO 和 SYO 时 n-3 PUFA 和 t18:1 的整体变化对人类健康可能是有益的，但从数量上看，大多数膳食 PUFA 都被完全生物氢化了。抑制 PUFA 的生物氢化将是提高 RG 牛 FA 组成的重要下一步。
