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Regulation of Pancreatic Exocrine Secretion in Ruminants: A Review^1,2,3,

^* Department of Animal Science, North Carolina State University, Raleigh, NC 27695-7621 and Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC 27710

Mechanisms regulating ruminant pancreatic exocrine function differ in some respects from those in nonruminants. This may affect the post-ruminal digestion of certain dietary nutrients such as starch. Ruminants do not exhibit clearly defined cephalic and gastric phases of pancreatic regulation, a likely consequence of the continuous nature of digesta flow from the rumen. Local neural reflexes and secretin-mediated exocrine responses may be more important than stimulation by cholecystokinin. Additionally, the ruminant pancreas may be stimulated by short-chain fatty acids produced in the rumen. A "ruminal phase" of pancreatic exocrine regulation has been proposed. The failure of cattle to digest efficiently starch in the small intestine may result from an asynchrony between delivery of starch to the intestines and pancreatic amylase release.

KEY WORDS: • pancreas • exocrine secretion • ruminants • sheep • cattle

¹ Presented at the 31st Annual Ruminant Nutrition Conference, entitled "Starch Digestion: Understanding and Potential for Improvement," at the Annual Meeting of the Federation of American Societies for Experimental Biology, April 1, 1990, Washington, DC.

² Guest editor for this symposium was C. B. Theurer, Department of Animal Sciences, University of Arizona, Tucson, AZ 85721.

³ The use of trade names in this article does not imply endorsement by the North Carolina Agricultural Research Service of the products named, nor criticism of similar ones not mentioned.

⁴ To whom correspondence should be addressed.

Manuscript received 26 June 1991. Revision accepted 16 July 1991.

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