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Motor activity in the large intestine of the pig related to dietary fibre and retention time

Published online by Cambridge University Press:  25 February 2008

J. Fioramonti
Affiliation:
Laboratoire de Physio-Pathologie Digestive INRA, Ecole Nationale Vétérinaire, 31076 Toulouse Cédex, France
L. Bueno
Affiliation:
Laboratoire de Physio-Pathologie Digestive INRA, Ecole Nationale Vétérinaire, 31076 Toulouse Cédex, France
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Abstract

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1. Large intestine electromyograms were recorded from four pigs receiving successively three diets containing different amounts of fibre (standard cereal diet, milk substitute and milk plus 170 g bran/kg). For each diet the mean retention time of a marker added to one meal was determined. Three occurrences of spontaneous constipation were also studied.

2. Slow waves were observed in the colon only during 10% of the recording time at a frequency of 10.3 ± 1.1/min. Two kinds of spiking activity were recorded on the colon: short spike bursts of 0.5–2 s duration and long spike bursts of approximately 7 s duration. Long spike bursts alone were recorded on the caecum.

3. The mean retention time of the marker was 40 h on the standard diet, 120 h on the milk-substitute diet, and 66 h on the milk plus bran diet.

4. On the standard diet, approximately 1500 colonic long spike bursts were recorded daily and short spike bursts occupied 15% of the recording time. On the milk diet, the number of long spike bursts decreased significantly (P < 0.01) to 500/d and the short spike bursts increased significantly (P < 0.05) to take up to 21% of the time. Intermediate values (1100/d and 19%) were observed when bran was added to the milk diet. The lowest values for long spike bursts (300/d) and highest values for short spike bursts (44% of the time) were observed in constipation.

5. It is concluded that long spike bursts are associated with propulsion of intestinal contents and that short spike bursts are non-propulsive.

Type
Papers on General Nutrition
Copyright
Copyright © The Nutrition Society 1980

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