Digestion dans l'intestin grêle chez le porc. 1. — Définition des conditions d'obtention des digesta

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Abstract
The existence of major disturbances of the gastro-intestinal food passage after re-entrant fistulation of the ileum in the pig, and the possible existence of a sphincter like function of the ileo-caeco-colic junction in this species, are recalled. Various techniques used are analyzed, i.e., cannulation, surgical techniques, re-entrant fistulation (ileo-ileal or ileo-caecal) methods and maintenance of preparation. A critical examination of literature data on digestion balance in the small intestine yields 5 essential principles which have to be respected in order that digesta collected may be like those normally emitted towards the large intestine. Transsection of the distal ileum and too early derivation of digesta should be avoided. The functional role of mechanical and bacterial barrier of the ileo-caeco-colic sphincter should be preserved. Cannulas with an inside diameter of 20 mm should be used and the length of the inert tube should be kept at a minimum. These conditions used to obtain digesta require development of a new surgical technique called post-valvular ileocolic fistulation, the principle of which is shown.