Abstract
Summary
One-to 5-day old chicks were exposed to a 10°C ambient temperature and cloacal temperatures Were recorded every 15 minutes for one hour. Young chicks show a rapid development of thermoregulation the first 5 days after hatching, with significant changes apparent even during the first day and one-half. This rapid homeothermic development is correlated with age and cannot be explained by increases in body weight, food intake, or insulation.
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