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Protein Intake and Heat Production¹

Institute of Animal Nutrition, Pennsylvania State College, State College

Results are presented of a study of the heat production of growing albino rats in relation to the protein contents of equicaloric diets containing approximately 10%, 25% and 45% of protein; and general conclusions are drawn from six similar studies, including the present experiment, on the same subject.

The special purpose of this last experiment was to determine the effects of maintaining the environment at all times definitely within the zone of thermal neutrality for the subjects. This improvement in conditions of experimentation was without observed effect on the results obtained, as compared with previous findings.

The metabolizable energy and the heat production diminished at about the same slight rate throughout the entire range of increase in the protein contents of the equicaloric diets, thus showing that it was the metabolizable energy, and not the protein content of these diets, which dominated the production of heat.

Other conclusions are given in the text.

Manuscript received 8 May 1944.