Am. Soc. Anim. Prod.
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Am. Soc. Anim. Prod. 1935:181-182
© 1935 American Society of Animal Science
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The Plane of Protein Intake as Affecting Food Utilization

E. B. Forbes, R. W. Swift, Alex Black and O. J. Kahlenberg

Pennsylvania State College

Abstract

The effects of four planes of protein intake (10, 15, 20 and 25 per cent) were studied by means of a 10-weeks' growth, metabolism and body analysis experiment on 48 albino rats. The rats were selected as 12 groups of four individuals, each group being of one sex and of the same litter, the rats in each such group receiving the same energy but different protein intake, there being 12 animals on each of the four treatments.

Growth increased with increase in protein to 20 per cent, but the 25 per cent group grew essentially the same as did the 20 per cent group.

With increased protein but constant energy intake the digestibility of the protein increased slightly, and linearly; urinary nitrogen increased at an increasing rate, and protein of body gain increased at a decreasing rate.

With increased protein but constant energy intake the feces energy decreased as the uninary energy increased, the metabolizable energy therefore being practically constant. The energy of the body gain and of the protein gain increased materially, and of the body fat the gain was slight.

With increased protein but constant energy intake the heat production diminished materially, apparently as the effect of decreased activity more than offset the increase in heat production due to the greater dynamic effect of protein than of the carbohydrate and fat which it replaced.

This paper will be published in full in the Journal of Agricultural Research.






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Copyright © 1935 by the American Society of Animal Science.