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Related Experiment Videos

Oestrogen pattern during early pregnancy in the mare.

M Terqui, E Palmer

    Journal of Reproduction and Fertility. Supplement
    |January 1, 1979
    PubMed
    Summary

    Measuring total estrogens during equine pregnancy reveals distinct ovarian and feto-placental contributions. Elevated plasma estrogen levels after Day 85 provide a reliable method for pregnancy diagnosis in mares.

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    Area of Science:

    • Reproductive biology
    • Endocrinology
    • Veterinary science

    Background:

    • Estrogen levels fluctuate significantly during the estrous cycle and pregnancy.
    • Understanding hormonal changes is crucial for reproductive management in mares.

    Purpose of the Study:

    • To characterize plasma total estrogen concentrations throughout equine pregnancy.
    • To differentiate the sources of estrogen production during gestation.
    • To evaluate the potential of estrogen measurement for pregnancy diagnosis.

    Main Methods:

    • Plasma total estrogens (conjugated and unconjugated) were measured via radioimmunoassay.
    • Measurements were taken from Day 0 to 100 of gestation and compared to estrous cycle levels.
    • Ovariectomy was performed to assess the origin of estrogen production.

    Main Results:

    • Estrogen levels mirrored dioestrus from Day 0-35, then increased to preovulatory levels by Day 40-60, originating from the ovaries.
    • A second estrogen increase after Day 60 was attributed to feto-placental sources, unaffected by ovariectomy.
    • By Day 85, estrogen concentrations surpassed non-pregnant levels, indicating successful gestation.

    Conclusions:

    • Equine pregnancy involves distinct ovarian and feto-placental estrogen production phases.
    • Plasma total estrogen measurement after Day 85 is a reliable indicator for diagnosing pregnancy in mares.

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