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Observations on reproductive performance in the yearling mare.

D Mitchell, W R Allen

    Journal of Reproduction and Fertility. Supplement
    |October 1, 1975
    PubMed
    Summary

    Reproductive performance in yearling mares showed a high rate of early pregnancy loss, with 44 out of 95 pregnant mares aborting. Factors like immaturity and stress may contribute to this reproductive challenge.

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    Area of Science:

    • Veterinary Science
    • Animal Reproduction
    • Equine Studies

    Background:

    • Yearling mares exhibit variable reproductive success.
    • Early pregnancy loss is a concern in equine reproduction.
    • Understanding factors affecting conception and gestation in young mares is crucial.

    Purpose of the Study:

    • To investigate the reproductive performance of yearling mares over four breeding seasons.
    • To identify the incidence of conception and early pregnancy loss.
    • To explore potential causes of spontaneous abortion in this cohort.

    Main Methods:

    • Studied 137 yearling mares bred with stallions over four seasons (1968-1971).
    • Utilized rectal palpation and PMSG tests for pregnancy diagnosis.
    • Conducted laboratory examinations of aborted fetuses and plasma progestagen assays.

    Main Results:

    • Ninety-five mares conceived, but 44 experienced spontaneous abortions between Days 30 and 160.
    • No infectious agents were identified in aborted fetuses.
    • Progestagen levels dropped consistently with conceptus loss, despite individual variations.

    Conclusions:

    • Yearling mares experience a high rate of early pregnancy loss.
    • Factors such as immaturity, poor nutrition, and physical stress likely contribute to abortions.
    • Further research into optimizing reproductive management for young mares is warranted.

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