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We investigated the aerobic scope of chicken embryos, that is, the margin of increase of oxygen consumption (V̇O2) above its normal value. V̇O2 was measured by an open-flow methodology at embryonic ages E3, E7, E11, E15, E19 and at E20 at the internal (IP) and external pipping (EP) phases, at the normal incubation temperature (Ta=38°C), in hypothermia (Ta=30°C) and in hyperthermia (Ta=41 and 44°C)...