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Mummified fetus in a mare

J A Barber1, M H Troedsson

  • 1Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.

Journal of the American Veterinary Medical Association
|May 1, 1996
PubMed
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Progestogen treatment after 100 days of gestation can cause mares to retain nonviable fetuses. Monitoring fetal viability is crucial to prevent prolonged retention of dead fetuses in horses.

Area of Science:

  • Veterinary Medicine
  • Reproductive Biology

Background:

  • Repeated early embryonic loss is a concern in equine reproduction.
  • Mummification is the preservation of a dead fetus within the uterus.

Purpose of the Study:

  • To investigate the role of progestogen administration in the retention of a nonviable equine fetus.
  • To highlight the importance of monitoring fetal viability during equine pregnancy.

Main Methods:

  • Case study of a 12-year-old Arabian mare experiencing recurrent pregnancy loss.
  • Administration of progestogen throughout gestation.
  • Observation of fetal expulsion and assessment of fetal age.

Main Results:

  • A mummified fetus was retained until approximately 325 days of gestation.

Related Experiment Videos

  • Progestogen treatment was administered throughout gestation and discontinued 2 weeks prior to expulsion.
  • Fetal size was consistent with 5 months of gestation, indicating a nonviable fetus retained for an extended period.

    • Conclusions:

    • Progestogen administration beyond 100 days of gestation can lead to the retention of nonviable fetuses in mares.
    • The fetoplacental unit's inability to produce adequate progestogens compromises fetal oxygen and nutrient supply.
    • Continuous monitoring of fetal viability is recommended to prevent prolonged retention of nonviable fetuses in equine pregnancies.