Abstract
Taste acuity in control and surgically desalivated rats was evaluated with a two-bottle preference test. Rats were presented with a choice between water and various concentrations of Nacl, HCl and quinine sulphate (QS) solutions. Intake of the latter solutions was expressed as a percentage of the total intake. Total volume intake was expressed as ml intake/g body weight. When presented with a choice between the water and salt solutions, both immediately and 7 months after desalivation, experimental rats showed a variable response as compared to controls, suggesting some type of abnormality in regulation of salt solution intake. Control rats showed a marked rejection of the HCl (range 5.2–16 per cent) and QS (range 4.2–11.8 per cent) solutions while the desalivated rats showed significantly less rejection (range 25–57.4 per cent for HCl and 73.7–31.8 per cent for QS). On most test days, volume intake of the desalivates was greater than the controls, both immediately and 7 months after desalivation. The data suggest a decrease in taste acuity in rats without normal salivary flow.
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