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Related Experiment Videos

Equine placentation.

W R Allen1, F Stewart

  • 1University of Cambridge, Department of Clinical Veterinary Medicine Equine Fertility Unit, Mertoun Paddocks, Newmarket, Suffolk, UK.

Reproduction, Fertility, and Development
|May 10, 2002
PubMed
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The equine embryo uses a glycoprotein capsule for support and nutrient acquisition during early pregnancy. Disruptions in placental development or fetomaternal contact can lead to foal runting and intrauterine growth retardation.

Area of Science:

  • Reproductive biology
  • Developmental biology
  • Veterinary science

Background:

  • Equine embryos are surrounded by a glycoprotein capsule from days 6-23 post-ovulation.
  • This capsule supports embryonic development and nutrient uptake from uterine secretions.
  • Embryonic mobility within the uterus is crucial for maternal recognition of pregnancy.

Purpose of the Study:

  • To describe the morphological and functional development of the equine conceptus.
  • To elucidate the formation and function of endometrial cups and the placenta.
  • To identify factors contributing to intrauterine growth retardation in foals.

Main Methods:

  • Histological examination of conceptuses at various developmental stages.
  • Analysis of hormonal profiles during equine pregnancy.

Related Experiment Videos

  • Observation of embryonic and fetal development in vivo.

    • Main Results:

    • The glycoprotein capsule facilitates early embryonic transport and nutrient acquisition.
    • Endometrial cups form from invasive trophoblast and secrete equine chorionic gonadotropin, influencing luteal development.
    • A diffuse epitheliochorial placenta with microcotyledonary exchange units develops.
    • Reduced fetomaternal contact area, due to twinning, endometrosis, or size discrepancies, causes intrauterine growth retardation and runting.

    Conclusions:

    • The equine embryo's capsule is vital for early development and mobility.
    • Placental development involves specialized structures like endometrial cups and microcotyledons.
    • Factors compromising placental function lead to significant fetal growth issues in horses.