Noble R C, Ogunyemi D
West of Scotland Agricultural College, Ayr, UK.
Biol Neonate. 1989;56(4):228-36. doi: 10.1159/000243127.
A study has been made of the changes in the weights, lipid and fatty acid compositions of the liver and residual yolk complex of the chick during the immediate period following hatching. By the 5th day after hatching about 85% of the gross weight and 90% of the lipid associated with the yolk complex had been absorbed. During this period, the composition of the yolk lipid displayed a marked increase in its proportion of cholesteryl esters and decreases in the triacylglycerides and phosphoglycerides. Whereas, in the triacylglycerides of the residual yolk after hatching there were changes in the proportions of the saturated fatty acids, in the phosphoglycerides there were distinctive changes in the proportions of the polyunsaturated fatty acids. Growth of the liver after hatching was associated with a substantial accumulation of fat. The very high level of cholesteryl esters associated with the embryonic liver was rapidly replaced by triacylglycerides in particular, and phosphoglycerides. The accumulation of the triacylglycerides was accompanied by a rapid change in their fatty acid composition away from that associated with embryonic development and differing markedly from that of the triacylglycerides being absorbed from the yolk. The changes in the lipid and fatty acid composition of the liver were indicative of the rapid alteration for the role of the liver in the lipid metabolism of the newly hatched chick.
对雏鸡孵化后即刻肝脏和残留卵黄复合体的重量、脂质及脂肪酸组成的变化进行了一项研究。到孵化后第5天，约85%的总重量以及与卵黄复合体相关的90%的脂质已被吸收。在此期间，卵黄脂质的组成显示胆固醇酯的比例显著增加，而三酰甘油和磷酸甘油酯的比例则下降。孵化后残留卵黄的三酰甘油中饱和脂肪酸的比例发生了变化，而磷酸甘油酯中多不饱和脂肪酸的比例则有明显变化。孵化后肝脏的生长与脂肪的大量积累有关。与胚胎肝脏相关的极高水平的胆固醇酯尤其迅速地被三酰甘油和磷酸甘油酯所取代。三酰甘油的积累伴随着其脂肪酸组成迅速从与胚胎发育相关的组成发生变化，且与从卵黄中吸收的三酰甘油的脂肪酸组成明显不同。肝脏脂质和脂肪酸组成的变化表明肝脏在新孵化雏鸡脂质代谢中的作用迅速改变。
