The effect of incubation temperature on oxygen consumption and organ growth in domestic-fowl embryos
1992
Zhang, Q. | Whittow, G.C.
1. Oxygen consumption and organ growth were measured in domestic-fowl embryos incubated at different temperatures (36, 38 and 4O degrees C). 2. Embryonic oxygen consumption was highest at an incubation temperature of 40 degrees C and lowest at 36 degrees C. These differences were ascribed largely to variations in embryo size at different incubation temperatures. 3. At incubation temperatures of 40 and 38 degrees C, there was a plateau in oxygen consumption late in incubation, but this was not apparent at 36 degrees C. 4. At 36 degrees C, some tissues (e.g. eyeballs) were "spared" the repression of growth that characterized the embryo as a whole, while other tissues (e.g. stomach) incurred a much greater growth reduction. Similarly, at 40 degrees C, stomach growth exceeded that of the embryo as a whole, while the eyeballs were largely spared the enhanced growth. 5. A simple index of tissue age revealed that, in general, there were consensual changes in tissue maturity and growth at different temperatures but that there were some disparities between growth and maturity in individual organs.
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