乌龟胚胎及仔龟的卵黄代谢

A Study on The Yolk Metabolism of Embryos and Hatchlings in Chinemys reevesii

摘要: 乌龟卵、卵黄、剩余卵黄和仔龟的含水量分别为68.87%、61.47%、60.75%和76.43%；干重分别为2.2915±0.2101 g、1.3071±0.2913 g、0.2681±0.0241 g和1.2305±0.2994 g；脂肪含量分别为18.03%、31.76%、32.10%和19.30%。卵黄、剩余卵黄和仔龟的热值分别为6.71 kcal/g DM、6.75 kcal/g DM和4.10 kcal/g DM；卵黄能量利用率为77.54%。在禁食状况下，仔龟卵黄斑大小、剩余卵黄重量变化与禁食时间呈显著直线负相关，并分别于孵化后的第9 d和第15 d消失。

Abstract: The water content of eggs,yolk,posthatching yolk and hatchlings averaged for 68.87%,61.47%,60.75% and 76.43% respectively.The dry mass of eggs,yolk,hatchlings and posthatching yolk averaged for 2.2915±0.2101 g,1.3071±0.2913 g,1.2305±0.2994 g and 0.2681±0.0241 g,respectively.The lipid content of them averaged for 18.03%,31.76%,19.30% and 32.10%,respectively.The energy value of yolk,posthatching yolk,hatchlings averaged for 6.71 kcal/g DM,6.75 kcal/g DM and 4.10 kcal/g DM.The utilization coefficient of energy of the yolk was about 77.54%.Under the condition of fasting food,both the fresh mass of posthatching yolk and the size of yolk scar in the hachlings showed the negative linear regression correlation with time.The yolk scar and posthatching yolk disappeared at the 9th and the 15th day after hatching respectively.