Nitrogen Content of Gastrointestinal Tracts of Rats During Absorptive Period.

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Abstract
By giving rats protein-free test meals and determining N levels in the gastro-intestinal contents, it was found that the basal level of endogenously supplied N is about 5 mg after 1 1/2 hours, and that this level is unaffected by protein depletion. On feeding skim milk powder, 22-27% of the ingested protein disappeared from the gastro-intestinal tract within 3 hours. Under the conditions of these experiments the alleged homeostatic action of the gut in supplementing amino acids to deficient protein meals may be only negligible. No significant differences were observed in gastric emptying time, rate of absorption, or digestion between skim milk powders dried at low or high temperature.

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