Abstract
In Experiment 1, wild-caught Norway rats failed to develop schedule-induced polydipsia at 80% free-feeding weight when placed on several fixed-time schedules. During Experiment 2 all of the wild-caught rats became polydipsic when body weight was reduced to 70% of free-feeding weight. Domestic Norway rats developed polydipsia at 80% free-feeding weight and remained polydipsic during body weight and fixed-time manipulations. Experiment 3 tested the generality of schedule-induced polydipsia to wild-caught and domestic cotton rats under several fixed-time schedules, body weight levels, and during a normal and reverse light/dark cycle. None of the domestic rats, and only one wild-caught rat, developed polydipsia. The findings extend schedule-induced polydipsia to wild-caught Norway rats but not to domestic or wild-caught cotton rats.
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