The heat production of 4 rats was measured by means of indirect calorimetry over 20 h/d at intervals of 4 min at ambient temperatures of 30, 25, 20 and 15 degrees C and feed intakes of 0, 4, 8 and 12 g/d. When the rats were hungry, their heat production was reduced by between 8 and 44 kJ/kg LW0.75.d. Feed intake increased heat production by between 54 and 102%. In the temperature range between 20 and 30 degrees C the rats required 0.36 kJ or 2.4% resp. of the metabolizable energy for the intake of 1 g feed. At 15 degrees C the corresponding values were 0.48 kJ or 3.2% resp. The activity-conditioned quota of heat production was estimated as 31 +/- 10%. In the temperature range of between 30 and 25 degrees C thermoregulatory heat production amounted to 5 and that in the temperature range between 25 and 15 degrees C to 20 kJ/kg LW0.75.d.K. No compensation of thermoregulatory heat by heat from increase of energy intake could be proved in the temperature range between 15 and 30 degrees C.
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