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Related Experiment Videos

Insemination doses: how low can we go?

Steven P Brinsko1

  • 1Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4475, USA. sbrinsko@cvm.tamu.edu

Theriogenology
|June 2, 2006
PubMed
Summary

Reducing the number of progressively motile sperm (PMS) used in equine artificial insemination can maintain high pregnancy rates. This review explores historical recommendations and modern data supporting lower insemination doses for fresh, cooled, and frozen semen.

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Area of Science:

  • Reproductive Biology
  • Veterinary Science
  • Animal Reproduction

Background:

  • The standard insemination dose for equine artificial insemination was established over 30 years ago.
  • The recommended dose of 500 x 10(6) progressively motile sperm (PMS) was based on maximizing pregnancy rates under suboptimal conditions.
  • This dose has remained largely unchanged despite advancements in mare management and semen handling.

Purpose of the Study:

  • To provide a historical overview of equine artificial insemination dose recommendations.
  • To review the origin and continued use of the standard insemination dose.
  • To present data supporting the reduction of sperm numbers in insemination doses for various semen types.

Main Methods:

  • Historical literature review of equine artificial insemination studies.

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  • Analysis of data from studies investigating reduced insemination doses.
  • Examination of techniques such as deep-horn insemination.

    • Main Results:

    • The historical recommendation of 500 x 10(6) PMS has been widely adopted for fresh, cooled, and frozen semen.
    • Evidence suggests that reduced sperm numbers can be effective for artificial insemination in mares.
    • Optimized techniques may allow for lower insemination doses without compromising pregnancy rates.

    Conclusions:

    • The established insemination dose for equine artificial insemination may be higher than necessary.
    • Reducing sperm numbers is feasible and supported by recent data for fresh, cooled, and frozen semen.
    • Further research and adoption of advanced techniques can refine insemination protocols and potentially reduce sperm requirements.