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2014 ; 133
(ä): 8-13
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Changes in the sexual behavior and testosterone levels of male rats in response
to daily interactions with estrus females
#MMPMID24813700
Shulman LM
; Spritzer MD
Physiol Behav
2014[Jun]; 133
(ä): 8-13
PMID24813700
show ga
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.