Influence of Microbiota on Metabolic Fecal Nitrogen in Rats

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Abstract
The influence of microbial flora on metabolic fecal nitrogen was determined with selected levels of protein up to 21.5%, fed as liquid and dry diets. Metabolic fecal nitrogen was less in axenic than in conventional rats when fed autoclaved dry or filtered liquid diets. Slopes of regression curves describing fecal nitrogen excretion were similar for axenic and conventional rats fed autoclaved diets, and much greater than in conventional rats on the nonautoclaved diets. The intercepts were similar for conventional rats on both nonautoclaved and autoclaved diets.