Shishkina G T, Borodin P M, Naumenko E V
Institute of Cytology and Genetics, Siberian Branch, Academy of Science of Russia, Novosibirsk.
Physiol Behav. 1993 Feb;53(2):389-93. doi: 10.1016/0031-9384(93)90223-3.
Parameters of sexual maturation and reproductive function were compared in two groups of Norway rats, one selected for reduced aggressiveness towards man and the other for aggressiveness. It was found that selection for reduced aggressiveness produced an acceleration of sexual maturation as judged by earlier vaginal opening in the female and presence of mature spermatozoa in the testes of the male as well by earlier prepubertal increase in plasma testosterone in the male. In domesticated adults, seasonal variations in the parameters of the reproductive function narrowed; they showed neither the winter decrease in sexual activity nor the marked fall in plasma testosterone and estradiol exhibited by their aggressive counterparts.
在两组挪威大鼠中比较了性成熟和生殖功能参数，一组是选择对人类攻击性降低的大鼠，另一组是选择具有攻击性的大鼠。结果发现，选择降低攻击性的大鼠会加速性成熟，这可以通过雌性大鼠更早的阴道开口、雄性大鼠睾丸中出现成熟精子以及雄性大鼠青春期前血浆睾酮更早增加来判断。在驯化的成年大鼠中，生殖功能参数的季节性变化变窄；它们既没有出现冬季性活动减少的情况，也没有出现其具有攻击性的同类所表现出的血浆睾酮和雌二醇的显著下降。
