Abstract
ON the eighteenth day after birth, rats considerably increase their oxygen consumption on exposure to cold1,2, and their rectal temperature falls at a much slower rate than in younger rats3. Hahn, Křeček and Křečková2, using the method described by Adolph4, concluded that both chemical and physical thermoregulatory mechanisms develop rapidly between the fourteenth and eighteenth day after birth. Křeček and Martínek5 demonstrated that in rats raised at 34° C. from birth, thermoregulation develops more slowly, so that on the eighteenth day after birth their rectal temperature falls very rapidly on exposure to cold.
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References
Antoškina, E. D., Fiziol. J. U.S.S.R., 26, 3 (1939).
Hahn, P., Křeček, J., Křečková, J., Physiol. Bohemoslov. (in the press).
Brody, E. B., Amer. J. Physiol., 139, 230 (1943).
Adolph, E., Amer. J. Physiol., 161, 359 (1950).
Křeček, J., and Martínek, J., Physiol. Bohemoslov. (in the press).
Bargeton, D., and Krumm-Heller, C., J. Physiol. (Paris), 41, 119 (1949).
Bartlett, R. G., Bohr, V. C., and Helmendach, R. H., Proc. Soc. Exp. Biol. Med., 85, 81 (1954).
Adolph, E., Amer. J. Physiol., 155, 366 (1948).
Hahn, P., Physiol. Bohemoslov. (in the press).
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HAHN, P. Effect of Environmental Temperatures on the Development of Thermoregulatory Mechanisms in Infant Rats. Nature 178, 96–97 (1956). https://doi.org/10.1038/178096a0
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DOI: https://doi.org/10.1038/178096a0
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