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Am J Physiol Regul Integr Comp Physiol 244: R273-R278, 1983;
0363-6119/83 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 244, Issue 2 273-R278, Copyright © 1983 by American Physiological Society

ARTICLES

Thermoregulatory heat production in cold-reared and warm-reared pigs

M. Heath and D. L. Ingram

Pigs were reared from 2 wk of age in either 10 or 35 degrees C and fed ad libitum. At 8 wk of age they were tested for the presence of regulatory nonshivering thermogenesis by administration of norepinephrine (NE) and propranolol. In addition, an electromyogram and carotid temperature, as well as a heat flow and skin temperature from one site, were monitored while the pigs were at ambient temperatures of 10, 15, 20, 25, and 30 degrees C. Cold-reared pigs showed a heightened response to NE in cold compared to thermally neutral environments. This was not observed in warm-reared pigs. Propranolol depressed O2 consumption more in cold-reared than in warm-reared pigs. Pigs reared in the cold also showed a higher intensity of shivering, tissue conductance, and skin temperature than warm-reared littermates. The shivering response of cold-reared pigs was more sensitive to changes in skin temperature than in warm-reared pigs.


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