Thermochemical Efficiency of Growth in Rats

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Abstract
A simultaneous study of changes in food intake and body composition during the 3 months of postweaning growth was undertaken on three large groups of albino rats fed semi-synthetic diets containing, respectively, 10, 25 and 60% protein. The results show a remarkable similarity of percentage of body weight represented by protein during the whole growth period for the three groups and constancy within each group. The thermochemical efficiency (ratio of calories deposited to calories ingested) was constant from weaning to puberty and particularly so on the diet with the protein content most favorable for growth (25%). The thermochemical efficiency, ratio of calories deposited to calories ingested, was approximately constant from weaning to puberty, on optimal diets and high protein diets, declined somewhat earlier on a low protein diet.
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