Breed W G, Washington J M
Department of Anatomy & Histology, Adelaide University, South Australia.
J Reprod Fertil. 1991 Sep;93(1):187-94. doi: 10.1530/jrf.0.0930187.
Hopping mice have extremely small testes and a reduced complement of male accessory sex glands. Nevertheless, greater than 1000 spermatozoa populate the isthmus of the oviduct after each insemination and a range of morphological types is found similar to that in the male tract. When females are primed with gonadotrophins they sometimes lock with more than one of the males within the group and in the present study two inseminations sometimes took place at the one oestrus. There is thus the possibility for intermale sperm competition within the female tract of these animals.
跳鼠的睾丸极小，雄性附属性腺的数量也减少。然而，每次授精后，输卵管峡部会有超过1000个精子，并且发现了一系列形态类型，与雄性生殖道中的相似。当雌性用促性腺激素预处理时，它们有时会与群体中的多个雄性交配，在本研究中，有时在一个发情期会发生两次授精。因此，这些动物的雌性生殖道内存在雄性间精子竞争的可能性。
