Changes in the sexual behavior and testosterone levels of male rats in response to daily interactions with estrus females

Abstract Male rat sexual behavior has been intensively studied over the past 100 years, but few studies have examined how sexual behavior changes over the course of several days of interactions. In this experiment, adult male rats in the experimental group ( n = 12) were given daily access to estrus...

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Bibliographic Details
Published in:Physiology & behavior 2014-06, Vol.133, p.8-13
Main Authors: Shulman, Leanne M, Spritzer, Mark D
Format: Article
Language:English
Subjects:
Analysis of Variance
Animals
Behavioral psychophysiology
Biological and medical sciences
Contraceptive Agents - pharmacology
Ejaculation
Estradiol - analogs & derivatives
Estradiol - pharmacology
Estrus - drug effects
Estrus - physiology
Female
Fundamental and applied biological sciences. Psychology
Intromission
Male
Mating
Ovariectomy
Progesterone - pharmacology
Progestins - pharmacology
Psychiatry
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Rat
Rats
Rats, Long-Evans
Sexual behavior
Sexual Behavior, Animal - drug effects
Sexual Behavior, Animal - physiology
Testosterone
Testosterone - blood
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Summary:Abstract Male rat sexual behavior has been intensively studied over the past 100 years, but few studies have examined how sexual behavior changes over the course of several days of interactions. In this experiment, adult male rats in the experimental group ( n = 12) were given daily access to estrus females for 30 min per day for 15 consecutive days while control males ( n = 11) did not interact with females. Ovariectomized females were induced into estrus with hormonal injections, and males interacted with a different female each day. The amount of sexual activity (mounts, intromissions, and ejaculations) was found to cycle with a period of approximately 4 days in most male rats. Additionally, blood was collected every other day following sexual interactions to assess serum testosterone levels. Testosterone was found to peak on the first day of interaction and then fell back to near the level of control rats that did not interact with females. Following the initial peak, testosterone concentrations fluctuated less in males exposed to females than in controls. Sexual activity was not found to predict testosterone concentration. We conclude that when male rats have daily sexual interactions, sexual behavior tends to show cyclic changes and testosterone is significantly elevated only on the first day of interactions.
ISSN:0031-9384
1873-507X
DOI:10.1016/j.physbeh.2014.05.001