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Homoeothermy and growth rate in the fowl.

Synopsis Observations on growth rates and diurnal changes in colonic temperatures were made on seven groups of 30 to 50 White Plymouth Rock x Cornish chicks aged between 6 and 8 weeks. Ambient air temperature ranged from 22 °C to 35 °C. Colonic temperatures in the morning (08.00 to 09.00 h) and growth rates were within the normal range. A slight hyperthermia was evident from 13.00 to 14.00 h. Morning colonic temperatures were not correlated with the later increments in body temperatures. This suggests that the set‐point temperature for thermo‐regulatory control differs between individuals. Growth rates were not correlated with the morning colonic temperature, except in one group; they were, however, significantly correlated with the diurnal fluctuation in colonic temperature in all groups. These results suggest that the maintenance of a constant body temperature is essential for a normal growth rate. The variation in thermoregulatory ability accounted for 31 to 71% of the total variation in growth rate.