Organisation de la motricité de l'intestin grêle chez le porc et influence de l'alimentation

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Abstract
A systematic study of the characteristics of small bowel myoelectrical complexes according to feeding was made in 10 Large White pigs. The intestinal electromyographic activities were recorded by means of chronic electrodes inserted under general anesthesia. The recordings were made after the animals had become accustomed to each of the 2 diets used in the experiment, i.e., a standard diet and a semi-synthetic diet including 82% purified maize starch. The feeds were offered in 2 meals, at 900 h and 1650 h. Two to 3 myoelectrical complexes were permanently present along the pig small bowel. After administration of the standard diet, the average number of myoelectrical complexes per 24 h was 20.4 at the level of the duodenum, 16.6 in the jejunum and 11.1 in the ileum. The feed intake was responsible for the occurrence of a particular post-prandial organization of the motility for about 2 h. During this period, the phase of quiescence was abolished and the irregular spiking activity was predominant without suppressing the regular activities. The increase in the degree of intestinal repletion led to an intensification of the irregular activities. The length of the quiescence period increased during the nocturnal eating pause. The important lengthening of the quiescent phase between the duodenum and the ileum, to the detriment of the irregular spiking phase, may be related to a smaller digestive repletion (relative to the same intake level), depending on the digestibility of the maize starch diet.

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