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Excretion of Total Nitrogen, Lysine and Methionine by Rats as Affected by the Type of Carbohydrate in the Diet^1,2,

Department of Biochemistry, Wyoming Experiment Station, University of Wyoming, Laramie, Wyoming

The effect of various dietary carbohydrates on the urinary and fecal excretion of nitrogen, methionine and lysine in rats was determined. Rats fed raw-potato starch and dextrin diets excreted a larger amount of fecal nitrogen and amino acids than rats fed sucrose, glucose or cornstarch. Rats fed raw-potato starch excreted less urinary nitrogen and more urinary methionine and lysine than rats fed carbohydrate from the other sources. During the growth period, rats fed raw-potato starch and dextrin exhibited lowest methionine availability compared with the rats fed sucrose, cornstarch, or glucose. During the protein repletion period, there were no significant differences in methionine availability among the various groups. The low protein utilization by rats fed raw-potato starch was accompanied by lowered excretion of urinary nitrogen and by increased excretion of urinary methionine and lysine.

² Supported in part by funds from the Regional Project W-57 of the Western Agricultural Experiment Stations.

Manuscript received 17 August 1964.