Abstract
Detection of reproductive status from chemical signals in the urine of a desert rodent was examined. Intact and castrated male and estrous (induced) and nonestrous (ovariectomized) female Dipodomys merriami were tested for their preferences for various combinations of water and urine from intact males, estrous females, castrated males, and nonestrous females. Intact and castrated males were also tested for their responses to urine from females at different stages of the reproductive cycle: proestrus, estrus, and diestrus. Neither intact nor castrated males exhibited a preference for urine from females in may stage of the estrous cycle. Urine from intact males, however, was preferred by both intact males and estrous females. Urine from reproductively active males, rather than from estrous females, seems to contain information for coordinating reproduction in D. merriami.
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