Abstract
This study was designed to determine whether ovulation in Peromyscus maniculatus bairdi is induced or spontaneous, and to determine the accuracy with which vaginal smears reflect the ovarian cycle. Ovarian histology, vaginal smears, and serum LH concentrations were compared among females inseminated 30 min or 24 h previously or housed alone. Deermice most frequently copulate in the dark period of their daily light cycle, and have variable vaginal smear patterns. Ovulation was spontaneous in the absence of tactile contact with the male and was not consistently related to the time of copulation. Serum LH values indicated a preovulatory surge. Marked variability was found in vaginal smear patterns, ovarian histology, and plasma LH concentrations.
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