Taylor G T, Weiss J
Physiol Behav. 1982 Dec;29(6):1019-23. doi: 10.1016/0031-9384(82)90293-1.
Research is reported which investigated the aggressive interactions between adult male rats in the presence of 17-27 day old juvenile conspecifics. Following a brief exposure to an inaccessible juvenile male, juvenile female, estrous adult female, or empty compartment, the males of Experiment 1 were allowed to interact with another adult male. Results were that the presence of both genders of juveniles reduced fighting between the adult males, and pre-pubertal females were particularly effective as an aggression-inhibitor. The hormonal bases for those sex differences were examined in Experiment 2 using juveniles gonadectomized on Postnatal Day 10. Adult males were more aggressive following exposure to intact juvenile males than to castrated juvenile males; the latter males, intact juvenile females, and ovariectomized juvenile females provoked similar and low rates of fighting between adult males. These data suggest that the sexual dimorphism is a function of testicular hormones present during the juvenile stage which modify the stimulus characteristics of a pre-pubertal male rat.
本文报告了一项研究，该研究调查了成年雄性大鼠在17至27日龄同种幼年个体在场情况下的攻击性互动。在短暂接触无法接近的幼年雄性、幼年雌性、发情期成年雌性或空隔间后，实验1中的雄性大鼠被允许与另一只成年雄性互动。结果表明，幼年两性的存在减少了成年雄性之间的争斗，且青春期前雌性作为攻击抑制剂尤为有效。在实验2中，使用出生后第10天进行性腺切除的幼年大鼠研究了这些性别差异的激素基础。成年雄性在接触完整幼年雄性后比接触去势幼年雄性更具攻击性；后一组雄性、完整幼年雌性和去卵巢幼年雌性引发成年雄性之间类似且低水平的争斗。这些数据表明，性二态性是幼年阶段存在的睾丸激素的作用，这些激素改变了青春期前雄性大鼠的刺激特征。
