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Department of Biochemistry, College of Medical Evangelists Loma Linda, California
The influence of carbohydrate upon the growth of rats fed casein and soybean alpha protein rations at levels from 12.5 to 25% has been studied.
At the protein levels studied, alpha protein rations with starch supported better growth of rats than those with sucrose. This effect was not seen with casein or heated soybean protein. No differences in coefficient of digestibility were observed; however, increased protein efficiency ratios were noted with unheated alpha protein when sucrose was replaced by starch.
Differences in rate of release of amino acids from protein, time of passage through the intestinal tract, and altered intestinal flora have been discussed as possible mechanisms.