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Early pregnancy loss in brood mares
G L Woods1, C B Baker, J L Baldwin
1Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
Journal of Reproduction and Fertility. Supplement
|January 1, 1987
Summary
Early pregnancy loss in mares is common, affecting 13% of pregnancies. Factors like twin pregnancies, early loss timing, and mare health significantly influence pregnancy outcomes and success rates.
Area of Science:
- Veterinary Medicine
- Reproductive Biology
- Equine Science
Background:
- Early pregnancy loss is a significant concern in commercial brood mare management.
- Understanding factors influencing pregnancy success is crucial for optimizing breeding programs.
Purpose of the Study:
- To investigate the incidence and influencing factors of early pregnancy loss in mares using ultrasonography.
- To identify key risk factors associated with pregnancy failure in equine reproduction.
Main Methods:
- Linear-array ultrasonography was employed to monitor pregnancies in commercial brood mares throughout 1985.
- Data collected included pregnancy rates, early pregnancy loss rates, and influencing variables such as twinning, age, and reproductive history.
Main Results:
- 54% of cycles resulted in detected pregnancy, with a 13% early pregnancy loss rate.
- Twin pregnancies (10/41) and losses at 2-4 weeks (29/60) showed significantly higher rates.
- Mares with endometritis history (7/26) and older mares exhibited increased pregnancy loss.
Conclusions:
- Early pregnancy loss in mares is influenced by multiple factors including twinning, gestational timing, and mare-specific conditions like endometritis.
- Breeding mares at foal heat resulted in lower pregnancy rates compared to subsequent estrus cycles.
- Age significantly impacts both pregnancy and pregnancy loss rates in mares, with older mares showing poorer outcomes.