Abstract
Abstract 1. 1. There was no significant difference in the ad libitum water exchange of the cotton rat, Sigmodon hispidus, and the prairie vole, Microtus ochrogaster. 2. 2. On minimum water rations, both species showed a significant reduction in water exchange by all avenues. However, the weight-specific water exchange of the cotton was about one-half that of the prairie vole. 3. 3. The maximum urine concentration of the cotton rat was 2734.4 mOsm/kg H2O as compared to 2083.8 mOsm/kg H2O for the prairie vole. 4. 4. The results suggest that the cotton rat has a greater ability to conserve water during periods of water restriction.
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