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Abstract
1. Development of brain temperature regulation was studied in the domestic fowl (Gallus gallus domesticus) from hatching to 21 d of age.
2. Body and brain temperature at hatching were relatively low compared with adult levels. However, both were effectively regulated at ambient temperatures of 30 and 35°C, with only a minor difference between the 2 temperatures.
3. Body and brain temperature increased as a power function of age at significantly different rates, approaching adult levels at around 10 d of age and resulting in a linear increase in body‐to‐brain temperature difference with age.
4. The results indicated the existence of different patterns of post‐hatching development of brain temperature regulation in relation to the degree of precocity of a species.