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The Polyunsaturated Fatty Acid Composition of Beef and Lamb Liver

机译:牛肉和羔羊肝的多不饱和脂肪酸组成

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The effect on liver fatty acids of two typical beef production systems, steers fed grass (grazing) and bulls fed concentrates, was investigated. Liver fatty acids were also studied in lambs grazing grass. Total fatty acid content of liver in the beef animals was not affected by production system, being 3.5% for grass and 3.7% for concentrates although carcasses of the latter animals were leaner. The percentages of the major non polyunsaturated fatty acids (PUFA) were also similar: (concentrates in parentheses) 18:0, 25.2% (25.1%); 16:0, 13.3% (14.5%); 18:1 12.6% (14.0%). Total liver PUFA contents were similar for the two production systems and much higher than in muscle from the same animals. All n-3 PUFA were present in greater amounts in liver from grass fed animals andn-6 PUFA were higher in concentrate fed animals: mg/100 g liver, 18:3n-3 92 (32); 20:5 n-3, 151 (17); 22:5 n-3, 283 (108); 22:6 n-3, 83 (32); 18:2 n-6, 172 (444); 20:4 n-6, 194 (270). The P:S ratios were 0.20 (grass) and 0.32 (concentrates) and the n-6:n-3 ratios were 0.71 and 4.8, respectively. Livers from grass-fed lamb had a higher fat content, 4.9%, than the beef livers and a lower percentage of 18:0, (21%); but more 16:0, (16%) and 18:1 (21%). Total PUFA content of lamb's liver resembled that of beef liver and the composition was similar to that of the steers fed grass. However the concentrations of 18:3 n-3 and 22:6 n-3 were higher in lamb and contributed to a lower n-6: n-3 ratio of 0.46 although the P:S ratio of 0.18 was similar to that in beef liver. Ruminant liver is potentially a good source of C20 and C22 PUFA in the human diet particularly from grass fed animals, with a highly desirable n-6:n-3 ratio and this may be more important nutritionally than the low P:S ratio since people can offset this elsewhere in the diet.
机译:研究了两种典型的牛肉生产系统(饲喂草(放牧)的and牛和浓缩饲料的公牛)对肝脏脂肪酸的影响。还对放牧绵羊羔羊的肝脏脂肪酸进行了研究。牛肉动物肝脏中的总脂肪酸含量不受生产系统的影响,草中的肝脏总脂肪酸含量为3.5%,精矿中的总脂肪酸含量为3.7%,尽管后者的动物尸体更瘦。主要的非多不饱和脂肪酸(PUFA)的百分比也相似:(括号中的浓度)18:0,25.2%(25.1%); 16:0,13.3%(14.5%); 18:1 12.6%(14.0%)。两种生产系统的总肝PUFA含量相似,远高于同一动物的肌肉。草饲动物的肝脏中所有​​n-3 PUFA的含量都较高,而精饲料动物的n-6 PUFA含量较高:mg / 100 g肝脏,18:3n-3 92(32); 20:5 n-3,151(17); 22:5 n-3,283(108); 22:6 n-3,83(32); 18:2 n-6,172(444); 20:4 n-6,194(270)。 P:S比为0.20(草)和0.32(浓缩物),n-6:n-3比分别为0.71和4.8。草饲羔羊的肝脏脂肪含量比牛肉肝脏高4.9%,而18:0的百分比较低(21%);但更多的是16:0(16%)和18:1(21%)。羔羊肝脏的总PUFA含量与牛肉肝相似,其组成与饲草的grass牛相似。然而,羊肉中18:3 n-3和22:6 n-3的浓度较高,而n-6:n-3的比例较低,为0.46,尽管P:S的比例为0.18与牛肉相似肝。反刍动物的肝脏可能是人类饮食中C20和C22 PUFA的良好来源,尤其是草食动物,其n-6:n-3比例非常理想,并且在营养方面比低P:S比例更重要,因为人们可以抵消饮食中其他地方的这种情况。

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