Temperature and metabolism of chick embryos and hatchlings after prolonged cooling.
Temperature and metabolism of chick embryos and hatchlings after prolonged cooling.
复制标题
长时间冷却后鸡胚胎和雏鸡的温度和新陈代谢。
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
H. Rahn
中科院分区：
文献类型：
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作者：
H. Tazawa;H. Rahn
鸡胚和雏禽长时间冷却后，代谢和蛋温是否达到新的准平衡状态？在孵化期的后半段，鸡蛋的温度保持在38摄氏度的环境空气温度以上。这种差异从11天的0.2摄氏度增加到孵化前的2摄氏度，到孵化后7天增加到3摄氏度。当蛋或孵化的幼鸟暴露在28摄氏度的室内空气中时，在5小时内达到一个新的准平衡状态（定义为蛋的温度变化小于0.1摄氏度× hr-1）。蛋和环境温度之间的新差异从11天的0.1摄氏度到孵化前的1.2摄氏度不等，但在孵化后的6摄氏度增加到5天后的10摄氏度。在24摄氏度的准平衡状态期间，直到孵化时，代谢率维持在对照值的约40%，但此后到第1天迅速增加到70-95%。在少数情况下，从壳中出现是没有必要的准平衡温度和代谢率的增加。
Is a new quasiequilibrium state of metabolism and egg temperature reached after chick embryos and hatchlings are exposed to prolonged cooling? During the last half of the incubation period the chicken egg maintains a temperature above that of the ambient air temperature of 38 degrees C. This difference increases from about 0.2 degree C at 11 days to 2 degrees C just before hatching and to 3 degrees C by 7 days posthatching. When eggs or hatchlings are then exposed to room air at 28 degrees C, a new quasiequilibrium state is reached in 5 hr (defined as a change in egg temperature of less than 0.1 degree C X hr-1). The new difference between egg and ambient temperature varies from about 0.1 degree C at 11 days to 1.2 degrees C just before hatching, but increases in the hatchling from 6 degrees C right after hatching to 10 degrees C 5 days later. During the quasiequilibrium state at 24 degrees C the metabolic rate is maintained at about 40% of the control value up to hatching time, but thereafter rapidly increases to 70-95% by day 1. In a few cases emergence from the shell was not necessary for increases in quasiequilibrium temperature and metabolic rate.