Digestion des protéines dans l'intestin grêle chez le porc. II - Composition en acides aminés des digesta : influence de la source de protéines d'un régime à base d'amidon de maïs purifié et variations postprandiales

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Abstract
The ileal digestibility of amino acids (AA) of a maize starch based diet containing either fish meal or wheat gluten as a protein source, was previously reported (Darcy, Laplace et Duee, 1982). The post-prandial variation (24 h) in the AA composition of digesta collected by post-valvular ileo-colic fistulation after feeding the same 2 diets is described herein. The AA composition of digesta differed according to the dietary protein source, as evidenced in the mean 24 h samples and in each of 5 collections (0-4 h, 4-6 h, 6-8 h, 8-14 h, 14-24 h) after the meal. The total and free AA composition of digesta was studied by multivariate analysis (factorial analysis of correspondences) which allows comparison of the composition of digesta to that of dietary proteins, endogenous proteins and digesta collected with a protein-free diet. An estimation of the proportion of these various protein sources in the ileal digesta can be attempted. The influence of dietary protein was large even for a highly digestible source such as gluten, as demonstrated in the 1st postprandial hours for the gluten diet. It was evidenced later for the fish meal diet, but it persisted more than 12 h after feeding. The influence of dietary protein was probably due to some undigested protein fractions still present as that level. Studying the variations in the AA composition leads to a better understanding of the physiological events which may account for differences in ileal digestibility values. This measurement is more adequate than that performed at the fecal level.

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