Half a century of equine reproduction research and application: A veterinary tour de force.
Authors: Allen W R, Wilsher S
Journal: Equine veterinary journal
Summary
# Editorial Summary Over the past 50 years, advances in equine reproductive medicine have substantially transformed breeding outcomes in Thoroughbreds, with pregnancy rates per season rising from 70% to over 90% and foaling rates increasing from 55% to over 80%. Allen and Wilsher's review synthesises the pharmacological and diagnostic innovations that have driven this improvement, including artificial lighting protocols to advance spring cyclicity, real-time steroid hormone assays for cycle monitoring, prostaglandin and GnRH analogues for precise cycle control, and transrectal ultrasound for detailed assessment of follicular development, endometrial quality and ovulation timing. Endoscopic techniques—both flexible videoendoscopy for endometrial evaluation and rigid laparoscopy for oviductal clearance—have expanded the diagnostic and interventional toolkit available to studfarm veterinary surgeons, whilst the 1977 Contagious Equine Metritis outbreak catalysed essential changes to biosecurity and hygiene protocols across breeding establishments. For contemporary equine practitioners, this retrospective underscores how integrating multiple diagnostic modalities with targeted hormonal manipulation has become the standard of care, and serves as a reminder that vigilance around infectious disease control remains fundamental to maintaining herd health and reproductive efficiency.
Read the full abstract on PubMed
Practical Takeaways
- •Modern reproductive management combining artificial lighting, hormone assays, and ultrasound monitoring can reliably achieve >90% pregnancy rates in mares
- •Non-invasive diagnostic imaging (transrectal ultrasound) and endoscopy allow early intervention for reproductive problems, including accurate twin pregnancy reduction
- •Strict hygiene protocols and swabbing procedures implemented after the 1977 Contagious Equine Metritis outbreak remain essential for maintaining stallion and mare health in stud farms
Key Findings
- •Per season pregnancy rates in Thoroughbred mares increased from 70% to >90% over 50 years
- •Foaling rates improved from 55% to >80% through application of diagnostic and therapeutic advances
- •Pharmacological interventions including prostaglandins, GnRH analogues, and synthetic progestagens significantly enhanced cycle control and breeding efficiency
- •Transrectal ultrasound and videoendoscopy enabled accurate monitoring of follicle development, ovulation, early pregnancy diagnosis, and treatment of endometrial and oviductal pathology