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Journal of Nutrition Vol. 93 No. 2 October 1967, pp. 175-181
Copyright © 1967 by American Society for Nutrition
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Intestinal Carbohydrase Activity and Carbohydrate Utilization in Mature Sheep1

F. G. Hembry2, M. C. Bell and R. F. Hall

Agricultural Research Laboratory of The University of Tennessee, Oak Ridge, Tennessee3

Studies were undertaken to determine the levels of maltase, lactase, sucrase, amylase, and cellobiase in the mucosa of the duodenum, jejunum, and ileum and the rate of glucose absorption and maltose and starch utilization in the duodenum, jejunum, ileum, cecum, and colon of mature sheep. Carbohydrase assays show that maltase, amylase, sucrase, lactase, and cellobiase activities were higher in the jejunum than in the ileum and duodenum, and that the maltase activity was higher than the rest of the enzymes in each area. Glucose absorption from isolated segments of the jejunum, ileum, and colon of mature, anesthetized sheep increased for the first 7 minutes after substrate injection into the intestinal lumen, while the rate of glucose absorption from the cecum decreased. After 7 minutes, the rate of glucose absorption from the 4 intestinal areas was relatively constant. Rate of glucose absorption was most rapid in the jejunum, > cecum, > ileum, and > colon. Maltose utilization was greater in the jejunum than in the ileum and no detectable maltose utilization occurred in the cecum and colon. No starch utilization was detected in the isolated intestinal segments void of pancreatic amylase.

1 This manuscript is published with the permission of the Director of the University of Tennessee Agricultural Experiment Station, Knoxville.

2 Present address: Department of Animal Husbandry, University of Missouri, Columbia.

3 Operated by the Tennessee Agricultural Experiment Station for the U. S. Atomic Energy Commission under Contract no. AT-40-1-GEN-242.

Manuscript received 17 January 1967.




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