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Embryo transfer in subfertile mares.

T Katila, M Oijala, T Kotilainen

    Acta Veterinaria Scandinavica
    |January 1, 1989
    PubMed
    Summary
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    Embryo transfer in subfertile mares shows low efficiency. Recovery rates were 50%, with only 44% of transferred embryos resulting in pregnancy, indicating challenges in equine reproduction.

    Area of Science:

    • Equine reproduction and reproductive technologies.

    Background:

    • Subfertile mares, defined as those with at least two barren years, present unique challenges in assisted reproductive programs.
    • Embryo transfer (ET) is a key technology in equine breeding, but its success rates can be influenced by donor mare fertility status.

    Purpose of the Study:

    • To evaluate the efficiency of embryo recovery and pregnancy rates when using subfertile mares as embryo donors in an equine embryo transfer program.

    Main Methods:

    • Four subfertile mares were utilized as embryo donors.
    • Embryo recovery procedures were performed, and the subsequent transfer of recovered embryos into recipient mares was conducted.
    • Pregnancy rates following embryo transfer were monitored.

    Main Results:

    • The overall embryo recovery rate from the subfertile mares was 50%, with significant variation (0-100%) observed between individual donors.

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  • A total of 9 embryos were transferred, leading to a pregnancy rate of 44% among the recipient mares.
  • The study indicated that 20% of all flushings performed resulted in a pregnancy.

    • Conclusions:

    • The efficiency of embryo transfer programs utilizing subfertile mares as donors is notably low.
    • These findings suggest that while ET is feasible, the reduced fertility of donor mares significantly impacts overall program success rates in equine reproduction.