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Naturally occurring superfoetation in the rat

S Sparrow

    Laboratory Animals
    |January 1, 1977
    PubMed
    Summary

    Superfoetation, the fertilization of an already pregnant individual, was observed in Wistar rats. This rare reproductive event occurs in 0.09-0.27% of litters born in this specific rat strain.

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    Area of Science:

    • Reproductive biology
    • Mammalian reproduction
    • Animal model research

    Background:

    • Superfoetation is a rare reproductive phenomenon where secondary ovulation and fertilization occur during an established pregnancy.
    • Understanding the incidence of superfoetation in laboratory animals is crucial for accurate reproductive studies and colony management.

    Purpose of the Study:

    • To document a case of superfoetation in Porton strain Wistar rats.
    • To estimate the incidence of naturally occurring superfoetation in this specific rat colony.

    Main Methods:

    • Detailed observation and documentation of a superfoetation case in a Wistar rat.
    • Colony-wide data collection to determine the frequency of superfoetation across litters born.

    Main Results:

    • A case of superfoetation was successfully identified and described in the studied rat population.
    • The estimated incidence of superfoetation in this Wistar rat colony was found to be between 0.09% and 0.27% of litters.

    Conclusions:

    • Superfoetation, though rare, can occur naturally in Wistar rats.
    • The findings provide valuable data on the incidence of this reproductive anomaly in a controlled laboratory setting.

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