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Related Experiment Videos

Equine fetal kinetics: Presentation and location.

O J Ginther1, P G Griffin

  • 1Animal Health and Biomedical Sciences Veterinary Science Building University of Wisconsin-Madison Madison, WI 53706, USA.

Theriogenology
|July 1, 1993
PubMed
Summary

Fetal mobility in pony mares decreases significantly after month 4. By month 7, cranial presentation is established, and by month 9, the fetus typically occupies the uterine body and cord horn.

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Physical Interplay between Equine Fetus and Uterus from Day 180 to End of Pregnancy<sup>☆☆</sup>.

Journal of equine veterinary science·2022

Area of Science:

  • Reproductive biology
  • Equine ultrasonography
  • Fetal development

Background:

  • Understanding fetal mobility is crucial for assessing reproductive health in livestock.
  • Previous studies have provided limited data on the specific changes in fetal presentation and location during equine gestation.

Purpose of the Study:

  • To investigate the temporal changes in fetal mobility, including presentation and location, in pony mares throughout gestation.
  • To determine when specific fetal positions and uterine horn occupancy become established.

Main Methods:

  • Weekly ultrasonic examinations were performed on 10 pony mares from Day 40 of gestation to term.
  • Data collected included fetal presentation (cranial vs. others) and location within the uterus (umbilical-cord horn, noncord horn, uterine body).
  • Frequencies of presentation/location changes between successive examinations were analyzed.

Main Results:

  • Cranial fetal presentation increased significantly from Month 5 to Month 7, reaching 100% by Month 7.
  • Fetal mobility, indicated by presentation and location changes, progressively decreased after Month 4.
  • Fetal location shifted from the noncord horn towards the uterine body and cord horn, with a stable occupancy of both by Month 9.

Conclusions:

  • Fetal mobility in pony mares gradually decreases after the fourth month of gestation.
  • Cranial presentation is consistently achieved by Month 7, and a specific location within the uterine body and cord horn is established by Month 9.
  • These findings provide a detailed timeline for fetal positioning during equine pregnancy.

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