A secretion that blocks the vagina of some rodents and insectivores after mating.
- The day of detection of the vaginal plug was designated as day 0 of pregnancy.
- For timed matings, the morning that vaginal plugs were detected was considered embryonic gestation day 0.5.
- Females were examined daily for vaginal plugs and separated from males when positive.
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Syllabification: vag·i·nal plug
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