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  • Title: Interbirth interval and duration of pregnancy in hares.
    Author: Stavy M, Terkel J.
    Journal: J Reprod Fertil; 1992 Jul; 95(2):609-15. PubMed ID: 1518015.
    Abstract:
    The possibility of inducing superfetation in hares by artificial insemination (AI) was investigated. AI performed on various days during the second half of gestation did not result in new pregnancies, but all ongoing pregnancies were terminated 1-4 days after AI. We suggest that copulation during the last week of pregnancy, common among captive hares, may have a similar effect to that of AI in terminating pregnancies and inducing early deliveries. Intervals between successive deliveries that are shorter than the normal duration of gestation do not necessarily indicate superfetation and this phenomenon may be rare among hares in captivity as well as in the wild.
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