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Journal of Dairy Science Vol. 57 No. 3 308-313
© 1974 by American Dairy Science Association ®
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Parotid Secretion and Feeding in Sheep Following lntraventricular Injections of l-Norepinephrine, dl-Isoproterenol, Pentobarbital, and Carbachol

C. A. Baile and F. H. Martin

Smith Kline Animal Health Products, 1600 Paoli Pike, West Chester, PA 19380
and The University of Pennsylvania, Philadelphia, PA 19104

ABSTRACT

Our objective was to test the role of sensory cues in chemically stimulated feeding. We measured whether salivation rate changed only secondarily to the elicited feeding or if it changed even in the absence of feed. Six wethers each were prepared with bilateral lateral ventricular guides and a parotid duct cannula. Following wethers' recovery from surgery, feed intakes and parotid flows were measured after lateral ventricular injections of l-norepinephrine (540 nmol) , dl-isoproterenol (20 nmol) , pentobarbital (100 µmol) , carbachol (55 nmol) , and synthetic cerebrospinal fluid. These tests were compared to similar tests in which feed was withheld for 1h following injection. With l-norepinephrine (plus feed) salivary flow was greatest followed by pentobarbital. Carbachol elicited significant feeding, but salivation was suppressed. When feed was withheld as compared to when feed was present, parotid flow decreased in all tests. Subcutaneous injection of carbachol was followed by salivation which was normal following 55 nmol and copious after 2,700 nmol. We conclude because salivation increased only when feeding was permitted that the feeding was not the result of chemically stimulated sensory cues which elicit feeding anticipatory salivation.






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Copyright © 1974 by the American Dairy Science Association ®.