Evacuation gastrique de l'amidon et de l'azote d'un régime semi-purifié à base d'amidon de maïs chez le Porc

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Abstract
The kinetics of starch and N gastric emptying were studied after ingestion of a semipurified diet containing 82% maize starch and 7% proteins in 3 pigs submitted to a reentrant fistulation of the proximal duodenum to collect and sample their digesta. N was quantitatively determined according to Kjeldahl''s method. Starch was measured taking into account all true glucose (< 2%) and the .alpha. polymers of glucose to assess the relationship between gastric emptying and quantitative absorption of the hydrolysis products found in the portal vein. The method used did not lead to a quantitative determination of starch. It was developed in the laboratory by modifying Holz''s method and allowed the treatment of 200 samples a day. Gastric emptying of starch and N after a test meal supplying 800 g dry matter after 24 h fasting showed a short and very intense initial phase (23% starch and 28% N ingested are emptied within 15 min). A regular and slower course of gastric emptying is then observed. Within 7 h, 54% of the starch and the equivalent of 100% of the ingested N were collected. The amount of starch emptied by the stomach was always significantly related to that of the dry matter whatever the amount ingested. The kinetics of starch gastric emptying appeared to be the main factor controlling the kinetics of appearance of reducing sugars in the portal vein. The amount of N emptied by the stomach is less closely related to that of dry matter emitted and for a shorter time the lower the amount ingested. The relative magnitude of the apparent N emptying results from the addition of endogenous N and from a differential and faster emptying of N.