Abstract
Hypothermal effects on metabolic rate and blood gas properties were studied in chicken embryos. Hypothermia was applied in two manners; 1) the eggs were acutely exposed to 30 °C for 2 hr before measurement and 2) the incubation temperature was lowered to 35.5 °C from the beginning. V̇ O2 and V CO2 were notably decreased by both hypothennal procedures, but retardation of embryonic development V̇ CO 2 were notably decreased by both hypothermal procedures, but retardation of embryonic develepment was predominantly significant only in embryos incubated at 35.5°C. The retardation in development in the latter case seemed to be caused by the long-lasting decrease in metabolic rate. In other words, metabolic rate and blood gas properties were comparable with those of the control embryos (incubated at 38°C) whose development stage was similar to that of the embryos incubated at 35.5°C. On the other hand, acute hypothermia made by exposure to 30°C caused the increase in P O2, notable decrease in P CO2 and increase in pH of arterialized blood and mixed venous blood. These changes might be attributed to the marked decrease in metabolic rate and the unaltered facility of the gas exchange in the chorioallantoic capillaries during the acute hypothennal period.
Published Version
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