Influence of male-related stimuli on female postejaculatory refractory period in rats. 1998

L Y Yang, and L G Clemens
Department of Zoology, Michigan State University, East Lansing 48824, USA. yangly@ucla.edu

Female rats "pace" their sexual contacts with the male when tested in situations where they can escape from the male during copulation. The type and quality of vaginocervical stimulation that the females receive during copulation influences their pacing behavior. This study investigated the effect of several male-related stimuli on the female's postejaculatory refractory period (PER). Females were tested in a two-compartment test chamber from which they could escape the male through one of four openings along the bottom of the barrier separating the two compartments. Experiment 1 examined the influence of the seminal plug, the penile cup, and prostate secretions on the female's PER. Results showed that neither the seminal plug, the penile cup, nor prostate secretions contributed to the female's PER. Experiment 2 investigated the relation of pre-ejaculatory intromission frequency, ejaculation duration, and the number of pelvic thrusts during ejaculation to the female's PER. Results indicated that pre-ejaculatory intromission frequency and ejaculation duration but not the number of pelvic thrusts during ejaculation were significantly correlated with the female's PER. In addition, pre-ejaculatory intromission frequency was significantly correlated with ejaculation duration. Partial correlation analysis suggested that pre-ejaculatory intromission frequency affected ejaculation duration which, in turn, influenced the female's PER. This finding was further supported by the evidence that ejaculation duration and the female's PER were significantly shorter in tests in which the male ejaculated on the first or second intromission.

UI MeSH Term Description Entries
D008297 Male Males
D012033 Refractory Period, Psychological A delayed response interval occurring when two stimuli are presented in close succession. Period, Psychological Refractory,Periods, Psychological Refractory,Psychological Refractory Period,Psychological Refractory Periods,Refractory Period, Psychologic,Refractory Periods, Psychological,Period, Psychologic Refractory,Periods, Psychologic Refractory,Psychologic Refractory Period,Psychologic Refractory Periods,Refractory Periods, Psychologic
D003307 Copulation Sexual union of a male and a female in non-human species. Copulations
D004542 Ejaculation The emission of SEMEN to the exterior, resulting from the contraction of muscles surrounding the male internal urogenital ducts. Ejaculations
D005260 Female Females
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012726 Sexual Behavior, Animal Sexual activities of animals. Mating Behavior, Animal,Sex Behavior, Animal,Animal Mating Behavior,Animal Mating Behaviors,Animal Sex Behavior,Animal Sex Behaviors,Animal Sexual Behavior,Animal Sexual Behaviors,Mating Behaviors, Animal,Sex Behaviors, Animal,Sexual Behaviors, Animal
D012931 Social Environment The aggregate of social and cultural institutions, forms, patterns, and processes that influence the life of an individual or community. Social Context,Environment, Social,Social Ecology,Context, Social,Contexts, Social,Ecologies, Social,Ecology, Social,Environments, Social,Social Contexts,Social Ecologies,Social Environments
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus

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