Abstract
To investigate whether luteinizing hormone-releasing hormone (LHRH) influences the sexual behavior of male gray-tailed voles ( Microtus canicaudus), subcutaneous injections of LHRH (500 ng) were given to intact males and to castrated males with different levels of testosterone replacement. Intact voles, as well as castrated voles with Silastic capsules of testosterone propionate, showed significant facilitation of several parameters of masculine sexual behavior 2 hr after LHRH injection, compared to saline controls. Castrated voles without testosterone replacement showed no sexual behavior, even when injected with LHRH. These results support the hypothesis that LHRH regulates sexual behavior in M. canicaudus and that the behavioral response to LHRH is dependent on testosterone. The specific behavioral parameters affected suggest that LHRH changes the arousal component of masculine behavior in voles.
Published Version
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