Legrand P, Lemarchal P
Ecole Nationale Supérieure Agronomique, Laboratoire de Biochimie, Rennes, France.
Reprod Nutr Dev (1980). 1987;27(4):811-6.
Newly-hatched chickens from two lines selected for high or low abdominal fat/live weight ratio, were fed on a stock low-lipid diet (2.9 wt % lipids) for nine weeks. Linoleic acid made up 54.3% of dietary fatty acids. Their abdominal adipose tissue and liver triglycerides were then isolated for fatty acid analysis. The linoleic acid content of abdominal fat triglycerides was higher in lean than in fat chickens (19.2 vs 16.4% of triglyceride fatty acids, respectively). This difference was highly significant. Conversely, the level of monounsaturated fatty acids in the abdominal fat triglycerides was significantly lower (especially palmitoleic acid) in lean than in fat chickens. The proportion of linoleic acid in liver triglycerides was also higher in lean than in fat chickens (12.2 vs 5.5% of triglyceride fatty acids). The higher dilution of dietary linoleic acid within the depot fat of the fat line chickens shows that the flux of endogenous fatty acids from the liver was larger in these animals than in the lean ones. Moreover, the elevated amounts of palmitoleic acid (virtually absent from the diet) in the depot and liver triglycerides of fat chickens, was most likely caused by a higher delta 9-desaturating activity in the liver of the latter animals.
选用腹脂/体重比高或低的两个品系的刚孵化出的雏鸡，用低脂肪基础日粮（2.9%重量的脂质）喂养9周。亚油酸占日粮脂肪酸的54.3%。然后分离它们的腹部脂肪组织和肝脏甘油三酯进行脂肪酸分析。瘦鸡腹部脂肪甘油三酯中的亚油酸含量高于肥鸡（分别占甘油三酯脂肪酸的19.2%和16.4%）。这种差异非常显著。相反，瘦鸡腹部脂肪甘油三酯中的单不饱和脂肪酸水平（尤其是棕榈油酸）显著低于肥鸡。瘦鸡肝脏甘油三酯中亚油酸的比例也高于肥鸡（分别占甘油三酯脂肪酸的12.2%和5.5%）。肥系鸡的储存脂肪中日粮亚油酸的稀释度更高，这表明这些动物肝脏中内源性脂肪酸的通量比瘦鸡更大。此外，肥鸡储存脂肪和肝脏甘油三酯中棕榈油酸（日粮中几乎不存在）含量升高，很可能是由于后者肝脏中更高的Δ9-去饱和活性所致。
