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The Influence of Carrier of Gustatory Stimulation on the Cephalic Phase of Canine Pancreatic Secretion

Life Sciences Laboratories, Central Research Laboratories, Ajinomoto Co., Inc., 214, Maeda-cho, Totsuka-ku, Yokohama 244, Japan

The pancreatic secretory responses of dogs to various taste stimuli were examined in this study. Additionally, taste preferences were examined in 24-hour exposure tests to taste stimulus solutions as well as in short exposure tests to taste solutions mixed with commercial stock diet. The liquid and solid food preference tests produced quite different results. In dogs with cannulated gastric and duodenal fistulas, gustatory receptors were stimulated orally with 100 ml of taste stimulus solution (water, 0.05 M monosodium glutamate (MSG), 0.05 M citric acid or 0.3 M sucrose) mixed with 25 g of a carrier (commercial stock diet, purified diet or cellulose). Pancreatic secretory responses to the taste stimuli varied with the type of carrier. Stock diet carrier was a better stimulant than the purified diet for both protein output and volume flow. Taste stimuli with a cellulose carrier did not produce any pancreatic response at all. The differences in responses to the different carriers were gretear than the differences between taste stimuli when the same carrier was used. This experiment indicates that gustatory stimulation does influence the function of pancreatic secretion depending on the carriers used.

KEY WORDS: • oral stimulation • sugar • citric acid • glutamates • pancreatic secretion • preference • dog

Manuscript received 4 January 1979.

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