Abstract
The chick embryo during its early development reacts as a poikilothermic or “cold-blooded” animal (Romanoff, 1941), but as the incubation period progresses, the embryo acts more like a homeothermic or “warm-blooded” animal until about the 20th or 21st day when there is no marked response to changes in external temperature (Pembrey, Gordon, and Warren, 1895). Lamoreux and Hutt (1939) reported a pronounced rise in the body temperature of the chick during the first week after hatching. Randall (1942) found that the temperature of the Barred Plymouth Rock chick increases from a temperature identical to that of its environment (incubator at 38° to 39° C.) to about 41° C. (105.8° F.) ten days after hatching, after which time it approaches and remains within the limits of the diurnal variation of the adult. The same worker reported further that hypothermic death in chicks is primarily caused by anoxic paralysis of the respiratory .
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