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1. Pregnant New Zealand white rabbits were kept from 14 days pre-partum at an environmental temperature of 33 degrees C, and their offspring were reared at this temperature. 2. In response to a 4 hr cold exposure, animals (aged 90-180 days) raised in this way showed significant drops in colonic temperature (-2.7 +/- 0.5 degrees C) while control animals reared at 20 degrees C did not (+0.05 +/- 0.1 degrees C). 3. A reduced, monophasic endotoxin fever was observed in animals reared at 33 degrees C, while a normal biphasic fever was seen in rabbits originally reared at 20 degrees C and subsequently acclimated to 33 degrees C. 4. A greatly reduced temperature response to intravenous infusion of noradrenaline was also found in animals raised at 33 degrees C. 5. It is proposed that thermal afferent input during early life may play an important role in the development of the thermoregulatory system.

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