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Related Experiment Videos

Frozen semen management in equine breeding programs.

Paul R Loomis1, Edward L Squires

  • 1Select Breeders Service, Inc., 1088 Nesbitt Road, Colora, MD 21917, USA. paulloomis@selectbreeders.com

Theriogenology
|June 22, 2005
PubMed
Summary

Achieving success with frozen semen in mares involves proper handling and insemination techniques. Fertility data shows no significant difference in pregnancy rates whether mares are inseminated once or multiple times per cycle.

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Theriogenology·2020

Area of Science:

  • Equine Reproduction
  • Animal Science
  • Veterinary Medicine

Background:

  • Successful artificial insemination with frozen semen in horses requires meticulous attention to detail in semen handling, thawing, and insemination procedures.
  • Effective management of mares for insemination with cryopreserved semen is crucial for optimizing reproductive outcomes.

Purpose of the Study:

  • To review techniques for handling, thawing, and inseminating frozen equine semen.
  • To present fertility data from a commercial setting evaluating factors influencing pregnancy rates in mares inseminated with frozen-thawed semen.

Main Methods:

  • Analysis of two datasets (332 and 536 mare cycles) from the 2002 and 2003 breeding seasons.
  • Examination of pregnancy rates based on insemination timing and frequency (once vs. multiple times per cycle).

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  • Comparison of pregnancy rates between mares inseminated once within 6 hours post-ovulation and those inseminated twice per cycle.

    • Main Results:

    • No significant difference in pregnancy rates was observed between mares inseminated once or multiple times per cycle (Dataset 1: 51.5% vs. 51.7%; Dataset 2: 47.1% vs. 46.1%).
    • Mares inseminated twice per cycle (pre- and post-ovulation) had similar pregnancy rates to those inseminated once within 6 hours post-ovulation (48.1% vs. 47.3%).

    Conclusions:

    • Insemination frequency (once vs. multiple times) did not significantly impact pregnancy rates in this commercial setting.
    • Strategic insemination timing, including single insemination within 6 hours post-ovulation or dual insemination, yields comparable fertility results with frozen-thawed semen in mares.