Digestion dans l'intestin grêle chez le porc. 3. — Cinétique du passage de l'amidon et de l'azote au niveau iléal selon le mode de fistulation, la nature de l'amidon et le taux de protéines de l'aliment

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Abstract
Six castrated Large-White pigs with a live-weight range of 47-64 kg were used to compare the passage of starch and crude protein at the end of the small intestine, according to the mode of fistulation used, either ileo-cecal or post-valvular ileo-colic. The animals received 1 daily meal including a semi-synthetic feed based on purified starch (maize or wheat, 70% of the dry matter) and fish-meal (16.8-0% total crude protein). The digesta were collected every 2 h over the 24 h cycle. The amounts of crude protein (N .times. 6.25) and the amounts of starch (glucose and all its .alpha. derivatives) were measured in the digesta collected. In addition to previously reported peculiarities (Darcy, Laplace, Villers, 1980) differences due to the mode of fistulation were recorded. Some of them concerned the kinetics of passage, in the case of low protein diets: delayed maximum flow-rate of crude protein, and lower and delayed maximum flow rate of starch in the case of post-valvular collection. The lower apparent digestibility of crude protein, after intake of low protein diets, was confirmed by ileal collection, but failed to appear in the case of post-valvular collection. The influence of the type of starch on crude protein digestibility was evidenced only by post-valvular collection. Independently of these consequencies of the mode of fistulation, it appeared that the amount of endogenous N produced daily could be estimated at 70 g, at least; the apparent digestibility of wheat starch is better than that of maize starch; and digestion of starch is reduced by 5% in the case of protein free diets.