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Embryo recovery from exercised mares.

C J Mortensen1, Y H Choi, K Hinrichs

  • 1Department of Animal Science, College of Agriculture and Life Sciences, Texas A&M University, College Station, TX 77843-2471, USA. cmorten@clemson.edu

Animal Reproduction Science
|February 26, 2008
PubMed
Summary
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Exercising mares in hot, humid conditions negatively impacts reproductive efficiency, leading to reduced embryo recovery rates. This study highlights exercise-induced changes in ovarian follicle development and ovulation timing.

Area of Science:

  • Veterinary Science
  • Reproductive Biology
  • Equine Reproduction

Background:

  • Mare reproductive efficiency is crucial for successful breeding programs.
  • Environmental factors, such as heat and humidity, can influence physiological processes.
  • The impact of exercise on equine reproduction, particularly under challenging environmental conditions, requires further investigation.

Purpose of the Study:

  • To evaluate the effect of a daily exercise regimen on mare reproductive efficiency.
  • To compare embryo recovery rates between exercised and non-exercised (control) mares.
  • To assess exercise-induced changes in ovarian follicle development and ovulation in mares.

Main Methods:

  • Mares were subjected to a daily 30-minute exercise regimen in hot (>30°C) and humid (>50%) conditions.

Related Experiment Videos

  • Reproductive efficiency was assessed by comparing embryo recovery rates via uterine flushing on day 7 post-ovulation over two consecutive cycles.
  • Mares were crossed over to the opposite treatment group for subsequent cycles to control for individual variation.

    • Main Results:

    • Exercised mares exhibited significantly lower embryo recovery rates (34%) compared to control mares (63%).
    • Ovulation occurred from smaller follicles (39.8 mm vs. 41.5 mm) and the time from PGF(2alpha) administration to ovulation increased in exercised mares.
    • A trend towards a lower proportion of Grade 1 embryos was observed in exercised mares.

    Conclusions:

    • Exercising mares in hot and humid environments adversely affects reproductive efficiency.
    • Exercise is associated with altered ovarian follicle dynamics and ovulation timing.
    • Reduced embryo recovery rates in exercised mares suggest a negative impact on early embryonic development or transport.