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Related Experiment Videos

Superovulation in mares.

E L Squires1, P M McCue

  • 1Animal Reproduction and Biotechnology Laboratory, ARBL Building, Foothills Campus, Colorado State University, Fort Collins, CO 80523-1683, USA. smcdoug@ahc.co.nz

Animal Reproduction Science
|June 14, 2006
PubMed
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Superovulation in mares using equine FSH (eFSH) can increase embryo recovery for freezing. While effective, careful treatment criteria are needed to avoid issues like overstimulation and ensure optimal embryo yield.

Area of Science:

  • Reproductive biology
  • Veterinary medicine
  • Animal science

Background:

  • Mare embryo recovery rates are ~50% per cycle.
  • Superovulation aims to increase embryo yield for freezing.
  • Previous methods like eCG, GnRH, and inhibin vaccines showed limited success.

Purpose of the Study:

  • To review historical superovulation methods in mares.
  • To examine factors influencing mare response to equine FSH (eFSH).
  • To assess the efficacy and potential issues of eFSH treatment.

Main Methods:

  • Review of studies on equine pituitary extract (EPE) and purified eFSH.
  • Analysis of factors affecting eFSH response: treatment day, follicle size, injection frequency.
  • Comparison of pregnancy rates from transferred embryos from treated and untreated mares.

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Main Results:

  • Equine pituitary extract (EPE) and eFSH typically yield 3-4 ovulations and 2 embryos per cycle.
  • Treatment timing, follicle size, and injection frequency impact eFSH response.
  • Embryos from eFSH-treated and untreated mares show similar pregnancy rates.
  • eFSH treatment can advance the first ovulation of the breeding season.

Conclusions:

  • eFSH is a viable option for mare superovulation, increasing embryo yield.
  • Potential adverse effects include anovulatory/luteinized follicles and overstimulation.
  • Further research is needed to optimize treatment initiation and maximize ovulation rate without compromising embryo recovery.