Effect of regional changes to shell conductance on oxygen consumption and growth of chicken embryos

Kerstin Wagner-Amos, Roger S Seymour
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引用次数: 25

Abstract

Diffusive and perfusive gas conductances of the shell and chorioallantois of avian eggs are not homogeneous, leading to disequilibrium between the air cell gas and chorioallantoic venous blood. This study measured the embryonic ability to maintain oxygen consumption rate and growth under experimentally enhanced inhomogeneity of diffusive conductance, achieved by waxing half of the eggshell and exposing the other half to graded hyperoxia that doubled the oxygen gradient across the shell. Thus, the overall gas conductance was effectively normal but highly inhomogeneous. No differences were observed between the experimental and the control eggs in respiration, residual yolk or embryo growth rate from day 12 until day 20. The embryo was able to utilise the increase of oxygen in the environment to compensate for the loss of about half of its respiratory surface area under the wax. The results indicate that an even distribution of pores in the eggshell and uniformity of chorioallantoic perfusion are not required for successful avian development.

壳电导的区域变化对鸡胚耗氧量和生长的影响
蛋壳和绒毛膜尿囊的弥漫性和灌注性气体传导不均匀,导致空气细胞气体和绒毛膜尿囊静脉血之间的不平衡。本研究测量了胚胎在实验增强的扩散电导不均匀性下维持耗氧率和生长的能力,方法是将一半蛋壳打蜡,并将另一半暴露于梯度高氧环境中,使蛋壳上的氧梯度增加一倍。因此,总的气体电导实际上是正常的,但高度不均匀。试验第12天至第20天,试验鸡蛋的呼吸、残余蛋黄和胚胎生长速率与对照鸡蛋无显著差异。胚胎能够利用环境中氧气的增加来补偿蜡下大约一半呼吸表面积的损失。结果表明,蛋壳孔隙的均匀分布和绒毛膜尿囊灌注的均匀性并不是禽类发育成功的必要条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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