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Pancreatic Amylase, Plasma Glucose, and Insulin Responses to Propionate or Monensin in Sheep¹

Department of Animal Sciences, University of Kentucky, Lexington 40546-0215

ABSTRACT

Yearling wethers fitted with reentrant bile-pancreatic duct cannulae were in a two-part study of effects of duodenal propionate infusions or increased ruminal propionate caused by dietary monensin on pancreatic -amylase secretion and glucose and insulin in blood plasma. Continuous duodenal infusion of propionate increased concentrations of glucose and insulin in blood plasma of wethers fed alfalfa. Results supported a direct response of insulin secretion to propionate. Amylase secretion was not affected. Addition of monensin (22 ppm) to an 80% corn diet reduced the ratio of acetate:propionate in rumen, but bilepancreatic flow and amylase activity were unaffected. Monensin supplementation had little influence on glucose and insulin in blood plasma. Pancreatic -amylase secretion of ruminants seems to be a complex phenomenon that is not regulated strictly by fluctuations of glucose or insulin.

¹ The investigation reported in this paper (No. 84-5-180) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the director.