Albert D J, Jonik R H, Watson N V, Moe I V, Walsh M L
Psychology Department, University of British Columbia, Vancouver, Canada.
Physiol Behav. 1991 Sep;50(3):519-23. doi: 10.1016/0031-9384(91)90539-z.
At the end of that time, each female was assessed for aggressiveness toward an unfamiliar female intruder once each week for 3 weeks. Those females displaying a high level of aggression had their male cagemate changed. For half of the females, the new male cagemate was a castrated male with a testosterone implant. For the other half, the new cagemate was a castrated male without a testosterone implant. Replacement males had been subjected to surgery 9 weeks previously. There were no differences in the aggressiveness of females of the two groups on any of 3 subsequent weekly tests of aggression. In a 3-h evaluation of male sexual behavior, none of the 9 castrated males without testosterone replacement displayed sexual activity with an estrogen/progesterone primed ovariectomized female, but 6 of 9 males with testosterone replacement did. Reanalysis of the aggression data comparing the females whose males had no testosterone replacement and females housed with the 6 males that were sexually active also revealed no differences in aggression over the 21-day test period. Since pseudopregnancy is known to last 13 days, these results indicate that the continuous presence of pseudopregnancy is not required for maintenance of aggression by a female cohabiting with a sterile male.
在那段时间结束时，对每只雌性进行评估，每周一次，持续3周，观察其对陌生雌性入侵者的攻击性。那些表现出高度攻击性的雌性，其同笼雄性被更换。对于一半的雌性，新的同笼雄性是植入了睾酮的去势雄性。对于另一半，新的同笼雄性是未植入睾酮的去势雄性。替代雄性在9周前接受了手术。在随后的3次每周攻击性测试中，两组雌性的攻击性没有差异。在对雄性性行为进行的3小时评估中，9只未接受睾酮替代的去势雄性中没有一只与经雌激素/孕酮预处理的去势雌性表现出性活动，但9只接受睾酮替代的雄性中有6只表现出性活动。对攻击性数据进行重新分析，比较雄性未接受睾酮替代的雌性和与6只具有性活动的雄性同笼饲养的雌性，结果发现在21天的测试期内攻击性也没有差异。由于已知假孕持续13天，这些结果表明，与不育雄性同居的雌性维持攻击性并不需要假孕持续存在。
