Research Unit Muscle Biology and Growth, Leibniz Institute for Farm Animal Biology, 18196 Dummerstorf, Germany.
J Agric Food Chem. 2010 Jul 28;58(14):8314-21. doi: 10.1021/jf101145y.
The present study investigated the effects of dietary linolenic acid (ALA) versus linoleic acid (LA) on meat quality, fatty acid composition, and stearoyl-CoA desaturase (SCD) activity in longissimus muscle (MLD) and subcutaneous adipose tissue (SAT) of German Holstein bulls and the transfer of beneficial n-3 fatty acids into German corned beef sausages (GCB). Feeding LA- and ALA-enriched diets increased essential fatty acids in MLD and SAT. The ALA-supplemented diet decreased significantly the SCD activity in MLD and SAT, resulting in a reduced relative concentration of oleic acid in muscle. The relative proportion of CLAcis-9,trans-11 analyzed by HPLC was not different between groups in either tissue. GCB were produced by using the lean meat of bulls. Beef products of bulls fed the ALA-supplemented diet were rich in ALA and n-3 LC PUFA. Most importantly, there was no loss of n-3 fatty acids during processing under production conditions. Conclusively, the n-6/n-3 fatty acid ratio was beneficially low.
本研究旨在探讨饲粮中分别补充亚麻酸（ALA）和亚油酸（LA）对德系西门塔尔公牛肌肉（背最长肌，MLD）和皮下脂肪组织（皮下脂肪，SAT）品质、脂肪酸组成及硬脂酰辅酶 A 去饱和酶（SCD）活性的影响，以及有益的 n-3 脂肪酸在德式牛肉肠（GCB）中的转移。饲粮补充 LA 和 ALA 均可增加 MLD 和 SAT 中的必需脂肪酸。补充 ALA 可显著降低 MLD 和 SAT 中的 SCD 活性，导致肌肉中油酸的相对浓度降低。通过 HPLC 分析，两组组织中 CLAcis-9,trans-11 的相对比例无差异。GCB 是利用公牛的精肉生产的。饲粮补充 ALA 可使公牛牛肉产品富含 ALA 和 n-3LC-PUFA。尤为重要的是，在生产条件下加工过程中没有损失 n-3 脂肪酸。综上，n-6/n-3 脂肪酸比值有利降低。
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