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Medium-Chain Triacylglycerols Enhance Release of Cholecystokinin in Chicks¹

Laboratory of Animal Nutrition, School of Agriculture, Nagoya University, Nagoya 464-01, Japan

Whether medium-chain triacylglycerols (MCT) affect the plasma concentration of cholecystokinin (CCK) and crop-emptying rate in chicks was investigated after 0, 30, 60, 90, 120 or 180 min of diet intubation. Triacylglycerol sources used were corn oil [containing long-chain triacylglycerols (LCT)], glyceryl tricaprate and glyceryl tricaprylate at a level of 200 g/kg diet. Plasma CCK concentration was significantly enhanced in chicks given the two MCT treatments, but not in those given the LCT treatment, after 30 min feeding relative to the initial level. At all time points, chicks fed the diet containing LCT had significantly lower plasma CCK concentrations than those fed MCT, and chicks fed glyceryl tricaprate had higher concentrations than those fed glyceryl tricaprylate. Dietary MCT sources significantly delayed diet passage from the crop compared with dietary LCT. These results indicate that MCT are more potent stimulators of CCK secretion in chicks than LCT.

KEY WORDS: • medium-chain triacylglycerols • chicks • cholecystokinin • crop emptying

¹ Supported by grant-in-aid (04454110) for scientific research from the Ministry of Education Science and Culture in Japan.

² To whom correspondence should be addressed.

Manuscript received 23 September 1991. Revision accepted 22 April 1992.

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