Liu T, Lei Z M, Wu J P, Brown M A
Faculty of Animal Science and Technology, Gansu Agricultural University, No. 1 Yingmen Village Anning, Lanzhou, Gansu People's Republic of China 730070.
Faculty of Animal Science and Technology, Gansu Agricultural University, No. 1 Yingmen Village Anning, Lanzhou, Gansu People's Republic of China 730070 ; B&B Research & Development, LLC, 16835 SW 27th St., El Reno, OK 73036 USA.
J Food Sci Technol. 2015 Mar;52(3):1656-62. doi: 10.1007/s13197-013-1117-5. Epub 2013 Aug 20.
The objective of the study was to compare fatty acid composition of longissimus dorsi (LD) and kidney fat (KF) in Holstein steers (HS), Simmental steers (SS) and Chinese LongDong Yellow Cattle steers (CLD). All steers received the same nutrition and management but in different locations. Cattle were harvested at approximately 550 kg and fatty acid composition of longissimus dorsi and kidney fat was analyzed in samples taken after 3 days of aging. There was evidence (P < 0.05) that C18:3n6 was greater in KF than LD in CLD cattle but not in HS or SS cattle. Percentage C18:1n9, C18:2n6, C18:3n3, and n6 fatty acids were greater in LD than KF for all breeds (P < 0.05), but the difference between fat sources for n6 in CLD cattle was smaller than the other two breeds. The LD had greater percentage of polyunsaturated fatty acids (PUFA), monounsaturated fatty acids (MUFA), and a greater ratio of n6:n3 PUFAs compared to the KF in each breed (P < 0.05). The △(9)-desaturase catalytic activity index was greater in LD than in KF in each breed group (P < 0.05). Percentage cis-9, trans-11 CLA was greater in KF than LD in HS (P < 0.05) but not SS or CLD cattle. These results indicate fatty acid percentages generally differed between longissimus dorsi fat and kidney fat. Further, there was some indication that some of these differences between fatty acid deposition sites were not consistent across breed group.
本研究的目的是比较荷斯坦公牛（HS）、西门塔尔公牛（SS）和中国陇东黄牛公牛（CLD）背最长肌（LD）和肾周脂肪（KF）的脂肪酸组成。所有公牛均接受相同的营养和管理，但饲养在不同地点。牛在体重约550千克时屠宰，背最长肌和肾周脂肪的脂肪酸组成在屠宰后3天取样进行分析。有证据表明（P < 0.05），CLD牛的肾周脂肪中C18:3n6含量高于背最长肌，而HS或SS牛则不然。所有品种中，背最长肌的C18:1n9、C18:2n6、C18:3n3和n6脂肪酸百分比均高于肾周脂肪（P < 0.05），但CLD牛脂肪来源间n6的差异小于其他两个品种。与每个品种的肾周脂肪相比，背最长肌的多不饱和脂肪酸（PUFA）、单不饱和脂肪酸（MUFA）百分比以及n6:n3多不饱和脂肪酸比值更高（P < 0.05）。每个品种组中，背最长肌的△(9)-去饱和酶催化活性指数均高于肾周脂肪（P < 0.05）。HS牛的肾周脂肪中顺-9，反-11共轭亚油酸（CLA）百分比高于背最长肌（P < 0.05），而SS或CLD牛则不然。这些结果表明，背最长肌脂肪和肾周脂肪的脂肪酸百分比通常存在差异。此外，有迹象表明，脂肪酸沉积部位之间的一些差异在不同品种组中并不一致。
