Dietary influence on the m. longissimus dorsi fatty acid composition of lambs in relation to protein source

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• 作者：T.D. Turner^a ; ^{tyler.turner@agr.gc.ca} ; L. Karlsson^b ; C. Mapiye^a ; D.C. Rolland^a ; K. Martinsson^b ; M.E.R. Dugan^a
• 关键词：BCFA ; branch chained fatty acids ; CLA ; conjugated linoleic acid ; DM ; dry matter ; FAME ; fatty acid methyl esters ; MUFA ; monounsaturated fatty acid ; PUFA ; polyunsaturated fatty acid ; SFA ; saturated fatty acid ; UFA ; unsaturated fatty acid
• 刊名：Meat Science
• 出版年：2012
• 期刊代码：78_03091740
• 类别：abs
• 出版时间：August, 2012
• 卷：91
• 期：4
• 页码：472-477
• 文件大小：188 K

摘要

Dietary lipid effect, as a consequence of protein supplement, on lamb m. longissimus dorsi fatty acid composition was investigated, with emphasis on biohydrogenation intermediates. Crossbred lambs (White Swedish Landrace 脳 Texel) were fed a barley-based diet without (CON) or with protein supplements including peas (PEA), rapeseed cake (RC) or hempseed cake (HC). The HC diet resulted in the highest muscle 22:6n-3 proportion, with the RC diet being similar (P < 0.05). Protein supplement did not affect the c9,t11 conjugated linoleic acid (CLA) proportion, however the HC diet increased some minor CLA isomers, including t10,c12 CLA (P < 0.05). The t10-18:1 and total trans-18:1 were lowest for the RC diet (P < 0.05), likely relating to rumen conditions and precursor availability. The saturated, monounsaturated and branched-chain fatty acids were largely unaffected by protein supplement. In conclusion, feeding the RC diet lowered the t10-18:1 and total trans-18:1 in meat, and modestly increased 22:6n-3 content. The direction of these changes would be beneficial, making the RC diet the preferred protein supplement; however the magnitude of the changes in the present experiment may not be sufficient to have an impact on human health.