Bioavailability of polyunsaturated fatty acids (PUFA) in ruminants is enhanced by their protection from ruminal biohydrogenation. Both n–3 and n–6 PUFA fulfil important physiological functions. We investigated potentially different incorporation patterns of these functional PUFA into three beef muscles with different activity characteristics. We supplemented 33 Angus heifers with rumen-protected oils characterized either by mainly C18:2 n–6 (linoleic acid (LA) in sunflower oil) or by C20:5 (eicosapentaenoic acid (EPA)) and C22:6 (docosahexaenoic acid (DHA)), both prevalent n–3 PUFA in fish oil. Contents and proportions of n–3 and n–6 PUFA of total fatty acids were elevated in the muscles of the respective diet group but they were partitioned differently into the muscles. For EPA and DHA, but not for LA, the diet effect was more distinct in the extensor carpi radialis compared to longissimus thoracis and biceps femoris. Partitioning of PUFA in metabolism could be related to muscle function. This has to be confirmed in other muscles, adipose tissues and organs.

反刍动物中多不饱和脂肪酸（PUFA）的生物利用度可通过防止瘤胃生物氢化而提高。既Ñ -3和Ñ -6 PUFA履行重要的生理功能。我们调查了这些功能性PUFA在具有不同活动特性的三块牛肉肌肉中潜在的不同掺入模式。我们用瘤胃保护油补充了33个安格斯小母牛，其特征主要是C18：2 n –6（葵花籽油中的亚油酸（LA））或C20：5（二十碳五烯酸（EPA））和C22：6（二十二碳六烯酸（ DHA）），在鱼油中都流行n-3 PUFA。n –3和n的含量和比例–6各饮食组的肌肉中总脂肪酸的PUFA升高，但它们在肌肉中的分配不同。对于EPA和DHA，但对于LA而言，与，肌和long股二头肌相比，radial腕伸肌的饮食效果更为明显。PUFA在新陈代谢中的分配可能与肌肉功能有关。必须在其他肌肉，脂肪组织和器官中证实这一点。