Abstract
AN animal's maturity at birth is manifested in part by its degree of dependence on its environment, and by its changes in metabolic-rate with age as distinct from changes caused by its increasing size and varying body temperature. Some animals tend towards poikilothermy in the period immediately after birth, while others are only weakly homoeothermic1. Mount2,3 has shown that new-born pigs, on the other hand, of ages from 1 hr. onwards, react to exposure to a temperature of 4° C. with a marked rise in metabolic-rate, thus showing characteristics of the adult homœotherm. Mount's findings, however, were not in agreement with those of Holub, Forman and Ježková4, who concluded that thermogenesis in response to cold does not begin to appear in the young pig until the ninth day after birth.
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References
Gelineo, S., Usp. sovrem. biol., 47, 108 (1959).
Mount, L. E., Nature, 182, 536 (1958).
Mount, L. E., J. Physiol., 147, 333 (1959).
Holub, A., Forman, Z., and Ježková, D., Nature, 180, 858 (1957).
Holub, A., Ježková, D., and Forman, Z., Z. Physiol. Bohem., 7, 521 (1958).
Fisher, R. A., “Statistical Methods for Research Workers”, thirteenth ed. (Oliver and Boyd, Edinburgh, 1958).
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MOUNT, L., ROWEHL, J. Body-Weight and Age in Relation to the Metabolic-Rate of the Young Pig. Nature 186, 1054–1055 (1960). https://doi.org/10.1038/1861054a0
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DOI: https://doi.org/10.1038/1861054a0
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