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Effects of progesterone on lordotic responses to specific mating stimuli in hamsters
Authors:J D Buntin  R D Lisk
Affiliation:Department of Zoology, P. O. Box 413, University of Wisconsin-Milwaukee, Milwaukee, WI 53201 USA;Department of Biology, Princeton University, Princeton, NJ 08544 USA
Abstract:Mating-induced inhibition of sexual receptivity was examined in ovariectomized, estrogen (E) treated and estrogen plus progesterone (E + P) treated hamsters given 10 min of exposure to male mounting stimulation alone or to mounts, intromissions, and ejaculations at eight hourly intervals. In E + P treated females, no differential effects of exposure to full mating stimulation vs. mounting stimulation alone were observed. In contrast, females given E treatment alone showed a marked differential response. Fully mated, E-treated females showed more lordosis than E-treated females exposed to mounts alone during the initial test. However, total lordosis duration declined precipitiously in the fully mated group by 2 hr and remained significantly below that in other groups during subsequent tests. Levels of receptivity in E-treated females mounted-only remained relatively constant until 8 hr. These results suggest that P reduces the inhibitory effects of vaginocervical cues received during mating without affecting the response to mounting stimulation alone. In addition, vaginocervical stimulation may initially facilitate lordosis in E-treated females.
Keywords:Hamster  Lordosis  Mating  Estrogen  Progesterone  Vaginocervical stimulation  Sexual receptivity
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