[Effect of cold exposure on energy processes in the tissues and on the growth of rats in the early postnatal period].

The effect of different temperature conditions on postnatal development of rats has been investigated. Considerable deviations in growth rate, vitality of rats and tissue energetic processes during the intensive cold action (5-6 degrees C) have been revealed. Under such conditions the local increase of nest temperature up to 30 degrees C causes the growth stimulation, increase of vitality and optimization of energetic processes in liver and heart. The dependence of the studied indices on the degree of the thermoregulatory system formation is under discussion.