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The studies were carried out on baby rabbits born in autumn or spring in cages kept in an open shed. The air temperautre in the shed varied from 2 to 25°C but the nest temperature was almost independent of these changes and in the coldest part of nest amounted to 20—26°C. The normal body temperature of baby rabbits 1 hr after birth was equal to 34.2°C. During the first day it rose to approximately 37°C but then the increase was more slow and after 1 month it reached the normal temperature of adult rabbits (39.6°C). New-born rabbits kept separately are not able to maintain a constant body temperature even at relatively high ambient temperatures. The resistance to cooling, however, develops rather quickly. In 20°C 6-day-old rabbits retain constant body temperature and in 8°C 12-day-old specimens. The rate of body cooling of baby rabbits exposed to cold decreases with the age and this decrease is faster than the reduction of the relative body surface area (cm/g). The increase of resistance to cooling in baby rabbits during first 8 days after birth may be partly explained by the improvement in the mechanism of vasomotor regulation of the heat losses and probably also by the augmented rate of heat production. From the eighth day after birth the hair cover plays more important role in thermal economy of baby rabbits.

The Development of resistance to cooling in baby rabbits