Abstract
Female red-backed voles, Clethrionomys gapperi (Vigors), bred from wild stock trapped near Sudbury, Ontario, and maintained at 22 ± 2 °C and 18 h light and 6 h dark in the laboratory, showed no cyclic changes in their vaginal smear patterns. Copulation was followed by the development of corpora lutea in the ovaries, and it is concluded that the animal is an induced ovulator under the conditions of the experiment. The females released 5.1 ± 0.5 ova per ovulation, the gestation period was 18.5 ± 0.5 days, and litter size was 4.6 ± 0.2 pups in the laboratory.
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