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Endogenous Nitrogen Secretions into the Digestive Tract

Department of Animal Husbandry, University of California, Davis, California

Gastrointestinal contents of rats fed chromic oxide as an indicator and varying levels of whole-egg protein were analyzed at different time intervals after feeding for dry matter, nitrogen, and chromic oxide. Peak increases in the nitrogen content of the small intestine occurred at one and 8 hours after feeding. The nitrogen peak accumulation reached at one hour seemed to be of dietary origin. Accumulations of endogenous nitrogen secretions were principally responsible for the 8-hour peak increase. Endogenous nitrogen secretions appeared to increase with the level of protein in the diet. A method was proposed for the calculation of the magnitude of the endogenous secretions using nitrogenchromic oxide ratios. Use of this method gave a value of 563 ± 147 mg for the nitrogenous secretions, slough-off, and the like, by the digestive tract over a period of 4 days (8 feedings) when feeding a protein-free ration. This figure was equivalent to the amount of nitrogen consumed in 8 feedings with a 10% protein ration.