Lepri J J, Vandenbergh J G
Biol Reprod. 1986 Mar;34(2):370-7. doi: 10.1095/biolreprod34.2.370.
We investigated the reproductive biology of an induced ovulator, the pine vole (Microtus pinetorum). Male puberty, measured as age at first impregnation, was found to occur as early as 44 days of age. Female puberty measured as age at first conception, was found to occur as early as 32 days of age, considerably earlier than previously reported. Females paired with stud males exhibited a doubling of uterine weight within 12 h, and vaginal sperm were present after 48 h. This indicates that although behavioral responses to males--including mating--require prolonged contact, physiological responses to males occur rapidly. Chemosignals from males slightly increased uterine and ovarian weights of females, but chemosignals from other females did not. Young females paired with stud males for 48 h in the presence of soiled bedding from the female's family had significantly smaller increases in ovarian and uterine weights than similar females paired on clean bedding. Suppression of reproduction in female offspring while they remain with the extended family unit is discussed as a life-history tactic and as a possible mechanism for inbreeding avoidance.
我们研究了诱导排卵动物松田鼠（Microtus pinetorum）的生殖生物学。以首次受孕年龄衡量的雄性青春期最早在44日龄时出现。以首次受孕年龄衡量的雌性青春期最早在32日龄时出现，比之前报道的要早得多。与种雄配对的雌性在12小时内子宫重量增加了一倍，48小时后阴道内出现精子。这表明，虽然对雄性的行为反应（包括交配）需要长时间接触，但对雄性的生理反应发生迅速。来自雄性的化学信号使雌性的子宫和卵巢重量略有增加，但来自其他雌性的化学信号则没有这种作用。在存在来自雌性家族的脏 bedding 的情况下，与种雄配对48小时的年轻雌性，其卵巢和子宫重量的增加幅度明显小于在干净 bedding 上配对的类似雌性。抑制雌性后代在与大家庭单位共同生活期间的繁殖被讨论为一种生活史策略以及一种避免近亲繁殖的可能机制。
