Stimulus control of ovulation in red-backed voles (Clethrionomys gapperi)

Abstract

Reproductive function is under the control of stimuli mediated by the central nervous system in many species . In species classified as "induced ovulators," ovulation is generally contingent on external stimuli, particularly the vaginal stimulation derived from males during copulation. However, although they are classified as induced ovulators, 7 of 17 female redbacked voles tClethrionomys gappen; ovulated when housed either across a mesh barrier from a male or in isolated cages in a room containing males. There was no appreciable difference as a function of housing condition. Thus, red-backed voles ovulate in response to a variety of stimuli and do not require copulatory stimulation. Unmated Clethrionomys appear to ovulate more readily than do Microtus. The categoryof "induced ovulation" requiresrefinement.365