Norris M L, Adams C E
Lab Anim. 1979 Jul;13(3):283-6. doi: 10.1258/002367779780937762.
Keeping a sexually mature male with a weanling female rat advanced neither the time of vaginal opening nor that of 1st oestrus. In 2 of 3 experiments females kept singly after weanling reached sexual maturity significantly earlier than did grouped females. The reproductive performance of females mated at 1st oestrus was not significantly different from that of older primiparae. 26 rats gave birth to an average of 9.3 young at 59.5 days of age, and 22 of them reared 96% of the young to weaning.
将性成熟的雄性大鼠与刚断奶的雌性大鼠饲养在一起，既不会提前阴道开口时间，也不会提前首次发情时间。在3项实验中的2项中，断奶后单独饲养的雌性大鼠比群居雌性大鼠显著更早达到性成熟。首次发情时交配的雌性大鼠的生殖性能与年龄较大的初产雌鼠没有显著差异。26只大鼠在59.5日龄时平均产仔9.3只，其中22只将96%的幼崽抚养至断奶。
