Summary ― 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 estimate 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.
Summary ― The present work aimed at quantifying nitrogen (N) and amino acid (AA) fluxes in the digestive tract of growing pigs fed a casein diet. In this paper we report on digesta passage at the terminal ileum, on apparent balances at the ileal and faecal levels, and on nutrients appearance in the portal vein. Digesta flow-rate at the terminal ileum was maximum between 6 and 12 h after the meal. About 10% of N and 5% of total AA ingested were recovered within 24 h. AA absorption started 30 min after the meal, and was measurable until 13 to 14 h. The total AA absorbed in 24 h accounted for 128% of the AA ingested. The
A comparison of various methods for the determination of the digestibility of crude protein in chickens was made. The chemical methods of dividing faeces and urine according to HARTFIEL and EKMAN were tried out, and a new method based on the determination of alpha-NH2-N was developed and tested. Colostomy of hens served as the basis of the comparison for the correctness of the chemical methods. The best approximation to the digestibility quotient of the crude protein according to colostomy was achieved with the alpha-NH2-N-method, which can to a large extent be well automated and can do without N-determination. Faeces-urine-N-separation according to EKMAN also resulted in a good approximation to the values according to colostomy.
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