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Investigation of bank voles (Clethrionomys glareolus) from the field led Brambell & Rowlands (1936) to conclude that in this species ovulation occurs spontaneously during an oestrous cycle similar to that of the mouse. However, under laboratory conditions it has been shown that in several microtine rodents (e.g. Microtus spp. and Clethrionomys glareolus) ovulation is induced by copulation (Breed, 1967; Richmond & Conaway, 1969; Clarke, Clulow & Greig, 1970; Clulow & Mallory, 1970; Cross, 1972; Gray, Davis, Zerylnick & Dewsbury, 1974). The aim of the present work was to investigate whether ovulation in the bank vole can be induced by stimuli from males other than those provided by coitus.
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