Protein digestion and absorption measured by re-entrant cannula in the pig
1979
A series of experimental diets were used on pigs whose digestive tracts had been surgically reconstructed, to obtain information on the digestion and absorption of proteins. The 3 levels of reconstruction were: distal to the bile and pancreatic ducts (duodenal); 13 to 17% of small intestine (jejunal); and 98% of small intestine (ileal). Minor losses of the dietary amino acids were noted during passage of the stomach and duodenum, presumably through absorption. Total nitrogen showed no gain in spite of addition of endogenous nitrogen. Jejunal absorption seemed to be about the same, though glycine and cystine showed gains. The apparent absorption rate of the lower ileum was 81-95% of the dietary amino acids. This would indicate that measurement of dietary nitrogen is most valid when obtained from the ileal digesta. These results do not agree with other animal studies, though it is thought that differences may be explained by use of different surgical techniques.
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