― The aim of the present study was to measure the incorporation of infused 15 N in blood fractions, urine, digesta, faeces and in the exocrine pancreatic and biliary secretions, in order to esti- mate the endogenous part of nitrogen in the ileal digesta and in the faeces of pigs fed a casein diet and to calculate the total endogenous nitrogen secretion as well as its recycling in the digestive tract. For 8 d 11 Large White female pigs (50.1 1.8 kg) received a continuous infusion of L -[' S N]leucine via a catheter in the jugular vein. The 15 N-enrichment was measured in several fractions. The 15 N- level of the pancreatic juice was higher than that in the biliary secretion, TCA-blood fractions, and urine during the whole experimental period. Using the 15 N-isotope dilution method it was found that casein was completely digested up to the terminal ileum and that all the nitrogen in the ileal digesta was of endogenous origin. The total endogenous secretion was estimated at = 11 g N/d. The reab- sorption of endogenous nitrogen amounted to 79% up to the end of the small intestine and 88% over the whole digestive tract. endogenous nitrogen I intestine I digestion I absorption I pig Rsum ― Contributions exognes et endognes aux flux d'azote dans le tube digestif du porc recevant un rgime base de casine. III. Recyclage de l'azote endogne. Le prsent tra- vail a tent d'estimer la proportion d'azote d'origine endogne dans les digesta ilaux et dans les
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Souffrant et al. (1993) studied this question.