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Journal of Nutrition Vol. 28 No. 5 November 1944, pp. 359-364
Copyright © 1944 by American Society for Nutrition
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The Effect of Feed on the Critical Temperature for the Albino Rat1

One Figure

R. W. Swift

Institute of Animal Nutrition, Pennsylvania State College, State College

The heat production of six mature, male, albino rats was determined while receiving a diet characterized by a high dynamic effect, and also while fasting, at environmental temperatures ranging from 15° to 34°C. The zone of thermal neutrality for the fasting rats was found to be from 28° to 33°C., the effect of feed being to lower both limits of this range by 1°C. About one third of the heat increment of the food as observed in the zone of thermal neutrality was manifest below the critical temperature.

1 Authorized for publication on June 13, 1944 as paper no. 1238 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

Manuscript received 15 June 1944.




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