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Related Experiment Videos

Parturition in the sheep.

G C Liggins, R J Fairclough, S A Grieves

    Ciba Foundation Symposium
    |January 1, 1977
    PubMed
    Summary
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    Sheep parturition begins with increased fetal cortisol, stimulating placental estrogen and decreasing progesterone. This hormonal shift triggers prostaglandin release, leading to uterine contractions and birth.

    Area of Science:

    • Reproductive Endocrinology
    • Mammalian Parturition

    Background:

    • Parturition initiation involves complex hormonal signaling.
    • Fetal adrenal activity plays a key role in triggering birth.

    Purpose of the Study:

    • To elucidate the hormonal cascade initiating parturition in sheep.
    • To understand the roles of fetal cortisol, placental steroids, and prostaglandins.

    Main Methods:

    • The study focuses on the hormonal changes preceding parturition.
    • It examines the interactions between fetal adrenal, placenta, and uterus.

    Main Results:

    • Fetal adrenal secretion of cortisol rises sharply, increasing fetal ACTH responsiveness.
    • Cortisol alters placental steroidogenesis, increasing estrogen and decreasing progesterone.

    Related Experiment Videos

  • This estrogen surge stimulates prostaglandin F2alpha release, inducing uterine contractions.

    • Conclusions:

    • The fetal adrenal-placental-uterine axis is central to sheep parturition.
    • Hormonal shifts, particularly increased estrogen and prostaglandin F2alpha, are critical triggers for birth.