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Related Experiment Videos

Infertility in the brood mare.

R C MacKay1

  • 1Riccarton, Christchurch, New Zealand.

New Zealand Veterinary Journal
|January 1, 1982
PubMed
Summary
This summary is machine-generated.

Artificial insemination of mares using a 21-year-old Standardbred sire achieved a 93.5% pregnancy rate. Optimal breeding timing and mare type contributed to a high live foal success rate of 84%.

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Area of Science:

  • Equine reproduction
  • Veterinary science
  • Animal breeding

Background:

  • Artificial insemination (AI) is a key technology in equine reproduction.
  • Optimizing AI protocols is crucial for maximizing conception rates in Standardbred horses.
  • Older stallions can be valuable breeding stock if their reproductive efficiency is maintained.

Purpose of the Study:

  • To evaluate the efficacy of artificial insemination in a 21-year-old Standardbred sire.
  • To determine pregnancy and live foal success rates in a large cohort of mares bred via AI.
  • To identify factors influencing reproductive success, such as mare type and breeding period.

Main Methods:

  • A 21-year-old Standardbred sire was bred via AI to 108 mares between September 11th and March 16th.

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  • Pregnancy was confirmed using positive pregnancy tests.
  • Data on insemination numbers per pregnancy, mare type (barren, maiden, wet), and breeding dates were recorded.

    • Main Results:

    • A high positive pregnancy test rate of 93.5% was achieved.
    • Mares required an average of 4.6 inseminations for pregnancy (range 1-13).
    • Breeding during January/February significantly improved the overall success rate, with a final live foal success rate of 84%.

    Conclusions:

    • Artificial insemination is highly effective for breeding older Standardbred stallions.
    • Mare type did not significantly impact pregnancy rates, indicating broad applicability of AI.
    • Strategic timing of insemination, particularly during mid-winter months, can enhance reproductive outcomes in equine breeding programs.