J. Anim Sci.
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J. Anim Sci. 1973. 37:164-168.
© 1973 American Society of Animal Science
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Inhibitory Effect of Acid in the Intestine on Rumen Motility in Sheep1

L. A. Bruce2 and T. L. Huber

University of Georgia, Athens 30602

Abstract

A RELATIONSHIP between duodenal acidification and rumen motility in sheep was investigated. Both the intravenous infusion of secretion (6.88 U/kg/hr.) and the duodenal infusion of lactic acid (pH 2.0, 0.7 M/1) inhibited amplitude and frequency of contractions. A more complete inhibition was obtained by acid infusion. Observations from cross-circulation and blood transfer experiments indicated that one or more hormones in addition to secretin was released by duodenal acidification which had stimulatory effects on intestinal motility and inhibitory effects on rumen motility similar to that described for cholecystokinin. It is concluded that intestinal hormones play a role in regulating rumen and intestinal motility during acid overloads of the rumen.

Footnotes

1 Published as Paper No. 942, University of Georgia, Institute of Comparative Medicine, Department of Physiology and Pharmacology.

2 Present address: Department of Physiology, University of Texas Southwestern Medical School, Dallas.






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