Early pregnancy testing and its relationship to abortion

Area of Science:

• Equine reproduction
• Veterinary science
• Animal breeding

Background:

• Pregnancy diagnosis in mares is crucial for reproductive efficiency.
• Traditional pregnancy testing is performed later in gestation.
• The impact of early manual pregnancy testing on abortion rates was previously unclear.

Purpose of the Study:

• To evaluate the effect of early manual pregnancy testing on abortion rates in mares.
• To determine if careful early pregnancy diagnosis influences reproductive outcomes.
• To assess the benefits of early identification of non-pregnant mares for re-mating.

Main Methods:

• Manual pregnancy testing was conducted on 487 Standardbred and Thoroughbred mares at multiple time points (20-24, 30-34, and >42 days post-service).
• Abortion rates from early testing protocols were compared to historical data using only later testing (>42 days).
• Careful manual examination techniques were employed during all testing phases.

Main Results:

• Early manual pregnancy testing, when performed carefully, did not result in an increased abortion rate.
• Mares identified as non-pregnant through early testing could be re-mated sooner within the same breeding season.
• The study demonstrated the safety and efficacy of early diagnostic procedures.

Conclusions:

• Careful early manual pregnancy testing is a safe and effective reproductive management tool for mares.
• Implementing early pregnancy diagnosis can optimize breeding programs by facilitating timely re-mating.
• This practice enhances overall reproductive efficiency in equine breeding operations.