Laboratory Animals > Volume 18, Number 1 > Pp. 33-35

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Some data on the fertility of bank voles (Clethrionomys glareolus britannicus) in the laboratory supporting the hypothesis of induced ovulation

F. O. Ödberg

Laboratorium voor Psychobiologie, Rijksuniversiteit Ghent, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium

83 (40%) litters with an average of 3·42 pups and unbiased sex ratio were born of 207 couples. Fertility and litter average were higher in summer and autumn. Most females were fertilized on the 1st day spent with a male, which supports the mating-induced ovulation hypothesis. Infantile mortality was highest at birth and during the 1st 5 days of life. 26% of the pups died before weaning (day 25), i.e. an average of 1 per litter.

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