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Perspectives in perissodactyls

I W Rowlands

    Equine Veterinary Journal
    |April 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Mare fertility rates remain low globally, with Hannoverian horses at 50% for 150 years. This study explores evolutionary history and unique reproductive physiology in perissodactyls to understand low mare fertility.

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    Area of Science:

    • Equine reproductive science
    • Paleontology
    • Mammalian evolutionary biology

    Background:

    • The global mare foaling rate is suboptimal, stagnating around 50% in the Hannoverian breed for over 150 years.
    • Perissodactyls, or odd-toed ungulates, exhibit a high extinction rate, with 152 out of 156 genera documented in the fossil record.
    • Understanding reproductive challenges in mares may offer insights into broader mammalian reproductive biology.

    Purpose of the Study:

    • To investigate potential reasons for the persistently low fertility rates observed in mares.
    • To examine the evolutionary history of perissodactyls in relation to their reproductive strategies.
    • To explore unique physiological characteristics of mares that might contribute to reduced fertility.

    Main Methods:

    • Review of the evolutionary history of perissodactyls, focusing on fossil records.
    • Analysis of reproductive physiology specific to the mare.
    • Correlation of evolutionary data and physiological traits with fertility outcomes.

    Main Results:

    • Perissodactyls demonstrate a high rate of extinction, suggesting evolutionary vulnerabilities.
    • Specific, unusual features within mare reproductive physiology are identified.
    • A potential link between these unique physiological traits and low fertility is proposed.

    Conclusions:

    • The evolutionary trajectory of perissodactyls may provide context for current reproductive inefficiencies in mares.
    • Unique aspects of mare reproductive physiology warrant further investigation as factors contributing to low foaling rates.
    • Addressing low mare fertility may require a deeper understanding of both evolutionary pressures and specific physiological mechanisms.