Johnson C B, Purchas R W, Birch E J
Department of Scientific and Industrial Research, Private Bag, Palmerston North, New Zealand.
Lipids. 1988 Nov;23(11):1049-52. doi: 10.1007/BF02535650.
The observation that the subcutaneous fat of pasture-fed Southdown rams consists of two distinct regions is reported. Fatty acid composition of fat from the outer and inner regions of subcutaneous tissue taken from the rib region of eight Southdown rams fed pasture were determined. Relative to the harder inner regions (mean melting point 43.1 degrees C), the softer outer regions (mean melting point 31.8 degrees C) were shown to contain more 9:0-, 15:0-, 17:0-, 17:1-, 18:1-cis and total 18:1 fatty acids; less 14:0-, 16:0-, 18:0- and 18:1-trans fatty acids; and a greater variety and a greater concentration of branched-chain components. Proportions of medium chain-length fatty acids, other than 9:0, did not differ between the layers. The fatty acid contents of serial samples taken at 1-mm intervals through these tissues were determined. Changes in concentrations of components among samples were gradual through the tissues. There was no clear connective tissue sheet, as has been reported for pigs. The inner region of the tissues contains apparently nonrandom fluctuating changes in fatty acid composition.
据报道，观察到以牧草饲养的南丘羊皮下脂肪由两个不同区域组成。测定了8只以牧草饲养的南丘羊肋骨区域皮下组织外层和内层脂肪的脂肪酸组成。相对于较硬的内层区域（平均熔点43.1摄氏度），较软的外层区域（平均熔点31.8摄氏度）含有更多的9:0、15:0、17:0、17:1、18:1-顺式和总18:1脂肪酸；较少的14:0、16:0、18:0和18:1-反式脂肪酸；以及种类更多、浓度更高的支链成分。除9:0外，中链长度脂肪酸的比例在各层之间没有差异。测定了以1毫米间隔穿过这些组织采集的系列样本的脂肪酸含量。样本中各成分浓度的变化在整个组织中是逐渐的。没有像猪那样报道的明显结缔组织片。组织的内层区域脂肪酸组成存在明显的非随机波动变化。
