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Pancreatic Lipase Secretion by Sheep¹

University of Kentucky, Lexington 40506

Abstract

Response of pancreatic lipase to source and level of dietary fat in sheep was investigated along with a characterization of ovine lipase specificity. Four sheep fitted with reentrant cannulas of the common bile duct were used to observe pancreatic lipase secretion when fed alfalfa hay ad libitum and when receiving duodenal infusions of 5 or 10% coconut oil or safflower oil. Infusion of either oil depressed (P < .05) total bile-pancreatic volume, total protein and specific and total lipase activity. The magnitude of depression was approximately equal for each oil as well as each level administered. The treatment effects on diurnal variation for total lipase activity were significant (P < .05); whereas, diurnal variation in total bile-pancreatic volume was inconsistent over time. The rates of hydrolysis of olive oil, corn oil, safflower oil, coconut oil, butterfat and beef tallow by ovine lipase were measured in vitro. Most rapid hydrolysis occurred with coconut oil and butterfat (P < .01). Beef tallow had the lowest rate of hydrolysis (P < .01).

¹ The investigation reported in this paper (No. 74-5-41) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.