Suppressed copulatory behavior and ovarian function in lactating Japanese monkeys (Macaca fuscata fuscata) during the mating season
Suppressed copulatory behavior and ovarian function in lactating Japanese monkeys (Macaca fuscata fuscata) during the mating season
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哺乳期日本猴（Macaca fuscata fuscata）在交配季节的交配行为和卵巢功能受到抑制
作者：
F. Mitsunaga;M. Nozaki;K. Shimizu
研究了日本猕猴（Macaca fuscata fuscata）交配季节泌乳对交配行为和卵巢功能的影响。将3只哺乳期雌性与幼崽一起饲养在室外群笼中，3只非哺乳期雌性与幼崽一起饲养在相邻的室外笼中。它们的交配方式是将四只轮流选择的雄性中的一只引入雌性的笼子，每周三次，每次两小时；记录射精交配的发生情况。在每个观察日采集血样，采用特异性放射免疫法测定血浆中雌二醇、黄体酮和黄体生成素（LH）水平。在非哺乳期雌性中，血浆雌二醇在进入交配季节的过渡期间增加，并在第一次排卵前约50天首次升至90 pg/ml以上。在非哺乳期雌鼠血浆雌二醇超过90 pg/ml后不久，就发生了射精交配。她们连续接受射精，直到卵巢黄体期早期。另一方面，在哺乳期的雌性中，在进入交配季节的过渡期间，它们的血浆雌二醇水平较低（低于90 pg/ml），并且在此期间它们没有射精。三个哺乳期雌性中有两个只排卵一次，而且她们只在排卵期接受射精，这与她们的血浆雌二醇水平超过90 pg/ml相吻合。其余的哺乳期雌性保持不排卵，在整个交配季节都没有射精。这些结果表明，由于卵巢功能受到抑制，哺乳期女性的性活动较低与血浆雌二醇水平较低明显相关。
The influence of lactation on copulatory behaviors and ovarian functions was studied in Japanese monkeys (Macaca fuscata fuscata) during the mating season. Three lactating females were housed in an outdoor group cage with their infants, and three nonlactating females were housed in an adjacent outdoor cage. They were mated by introduction of one of four rotationally chosen males into the females' cage, for two hours three times a week; the occurrence of ejaculatory copulations was recorded. Blood samples were collected on each observation day, and plasma levels of estradiol, progesterone, and luteinizing hormone (LH) were measured by specific radioimmunoassays. In nonlactating females, plasma estradiol increased during the transition into the mating season, and rose to levels over 90 pg/ml for the first time on about 50 days before the first ovulation. Shortly after plasma estradiol exceeded 90 pg/ml in the nonlactating females, the onset of ejaculatory copulations occurred. They received ejaculations continuously up to the early ovarian luteal phase. On the other hand, in lactating females, there were lower levels of plasma estradiol (below 90 pg/ml) during the transition into the mating season, and they received no ejaculation during that period. Two of the three lactating females ovulated only once, and they received ejaculations only during the periovulatory period, coinciding with the rise of their plasma estradiol levels over 90 pg/ml. The remaining lactating female remained anovulatory and received no ejaculation throughout the entire mating season. These results have demonstrated that the low sexual activity of lactating females is clearly correlated with low levels of plasma estradiol due to suppressed ovarian function.
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