Effects of single and multiple enforced intercopulatory intervals on the sexual behavior of male rats.

Bermant, Gordon

doi:10.1037/h0043537

Cited by 59 publications

(31 citation statements)

References 11 publications

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“…In accordance with previous studies (Larsson, 1956;Bermant, 1964), the results of Exp. I show that artificial prolongation of the interintromission intervals considerably reduces the number of mounts and intromissions required for ejaculation.…”

Section: Discussionsupporting

confidence: 93%

Short-latency effect of testosterone on copulatory behaviour and ejaculation in sexually experienced intact male rats

Malmnäs¹

1977

Reproduction

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The effect of a single injection of testosterone on the number of stimuli required to trigger ejaculation and on copulatory behaviour was investigated in sexually experienced intact male rats. An intraperitoneal injection of 100 microgram free testosterone 1 h before testing facilitated the copulatory behaviour and decreased the number of mounts and intromissions needed for ejaculation; the latter effect was obtained in a test in which a constant interval was kept between each intromission.

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Section: Discussionsupporting

confidence: 93%

Short-latency effect of testosterone on copulatory behaviour and ejaculation in sexually experienced intact male rats

Malmnäs¹

1977

Reproduction

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“…These studies have shown that increasing the duration of the enforced intervals up to 5 minutes decreases the number of intromissions needed to reach ejaculation. These data suggest that limited availability of the female increases male arousal and lowers the ejaculatory threshold [32]. Under MPCA conditions, a similar and even greater effect was observed.…”

Section: Discussionsupporting

confidence: 56%

“…In a pioneering study, Larsson showed that the number of intromissions needed to reach first ejaculation could be significantly reduced by separating the copulating pair after each intromission for a period of time greater than the normal intercopulatory interval [21,29,30]. This effect, called enforced interval effect, has been further corroborated by other authors [31,32]. These studies have shown that increasing the duration of the enforced intervals up to 5 minutes decreases the number of intromissions needed to reach ejaculation.…”

Section: Discussionmentioning

confidence: 82%

Copulatory Pattern of Male Rats in a Multiple Partner Choice Arena

Ferreira‐Nuño

Fernandez-Soto

Olayo-Lortia

et al. 2010

The Journal of Sexual Medicine

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Introduction It has been demonstrated that testing conditions may influence sexual performance in many mammals, including male rats. We recently developed a multiple partner choice arena (MPCA) consisting of four acrylic cylinders placed in a cross pattern with one male in each cylinder. A sexually receptive female rat was introduced into the center of the MPCA and was allowed to choose a male to copulate with. The female showed a preference for one of the four males, remaining longer and copulating more times with it. Aim The study aims to evaluate and compare the copulatory pattern of male rats in two arenas: the standard arena (SA) and the MPCA. Methods In Experiment 1, a group of 10 male rats mated in an SA (a closed cylinder) and 2 weeks later they mated in the MPCA, in order to compare different parameters of male sexual behavior. In Experiment 2, the sexual behavior of two different groups of sexually experienced male rats was tested in two conditions: the SA and the MPCA. In the latter, only the behavior of the preferred (P) males and nonpreferred (NP) males that ejaculated was recorded. Main Outcome Measures The main outcome is the number of intromissions preceding ejaculation and the latencies to mount, intromit, and ejaculate. Results In Experiment 1, the number of intromissions was significantly reduced and the intromission and ejaculation latencies were significantly shortened when the males were tested in the MPCA rather than in the SA. In Experiment 2, both groups of males tested in the MPCA (P and NP) showed a significant reduction in the number of intromissions preceding ejaculation and shorter mounting and ejaculation latencies in comparison with rats in the SA. This decrease was more noticeable in NP males. Conclusions The MPCA reduce significantly the ejaculatory pattern in male rats.

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“…Among males, a prolonged III, similar to that which occurs during paced mating, results in the expression or because each stimulus is more intense under paced than of intromissions which are significantly longer (approximately 600 ms) nonpaced mating conditions (8). As shown in the present study, than those exhibited by males who are able to intromit ad lib (approxiimmediate-early gene expression can be a useful tool in determinmately 500 ms);(41)(42)(43). In this experiment, long-duration intromissions ing which of these elements of mating stimulation have relevance were expected when males were allowed only to intromit with the experimental female at approximately 100 s IIIs.…”

mentioning

confidence: 51%

Effects of Paced Mating on c‐fos Gene Expression in the Female Rat Brain

Erskine

Hanrahan

1997

J Neuroendocrinology

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When estrous female rats control or pace (P) their sexual contacts with males, several neuroendocrine and behavioral responses to mating occur that are not observed or are greatly attenuated after nonpaced mating. The present study examined whether the distribution and amount of FOS immunoreactivity (FOS-IR) induced in brain by mating would be altered in females receiving paced rather than nonpaced mating stimulation. In the first experiment, females received 5 or 15 intromissions during paced mating tests (5P and 15P), 5 or 15 intromissions during nonpaced mating tests (5NP and 15NP), 15 mounts-without-intromission (MO) or remained in their homecages (HC). Selective increases 1 h after paced mating stimulation were observed in the posterodorsal medial amygdala (MePD), where significantly more FOS-IR cells were present in the 5P and 15P groups than in the respective NP groups. The 5P, 5NP and 15NP had significantly more FOS-IR than the HC, MO, and 5NP groups, and the 5P group had levels of FOS-IR which were equivalent to that seen in the 15NP group. In the posteromedial portion of the bed nucleus of the stria terminalis (BNSTpm) and the ventrolateral portion of the ventromedial nucleus of the hypothalamus (VMHvl), paced mating induced significantly greater numbers of FOS-IR cells than did either MO or HC treatments; increases induced by nonpaced mating were not statistically greater than HC controls. No differences between groups were seen in the medial preoptic area (mPOA). In the second experiment, experimentally lengthening the interintromission interval (III) as well as increasing the intromission duration to mimic the characteristics of paced mating, resulted in significant increases in FOS-IR in the MePD but not in the other three brain regions. These results demonstrate that paced mating is more effective in inducing c-fos expression than nonpaced mating, and that the MePD is particularly sensitive to differing characteristics of the mating stimuli received.

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Effects of single and multiple enforced intercopulatory intervals on the sexual behavior of male rats.

Cited by 59 publications

References 11 publications

Short-latency effect of testosterone on copulatory behaviour and ejaculation in sexually experienced intact male rats

Short-latency effect of testosterone on copulatory behaviour and ejaculation in sexually experienced intact male rats

Copulatory Pattern of Male Rats in a Multiple Partner Choice Arena

Effects of Paced Mating on c‐fos Gene Expression in the Female Rat Brain

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