Half a century of equine reproduction research and application: A veterinary tour de force.

The research article provides an overview of the advancements over the past 50 years in equine reproduction practices, with a focus on Thoroughbred mares, whose pregnancy and foaling rates have significantly improved due to pharmacological treatments and diagnostic methods.

Key Advances in Equine Reproduction

• The researchers first discussed the application of artificial lighting which has been used to speed up the onset of ovulatory oestrous cyclicity in early Spring. This manipulation of light exposure influences the reproductive cycle of mares, encouraging early breeding and successful pregnancies.
• The paper highlighted the importance of hormone assays in helping veterinarians determine the stage and normality of the mare’s reproductive cycle. These assays provide valuable insight into the mare’s hormonal state, impacting breeding and pregnancy management.
• Similarly, the use of prostaglandin analogues, synthetic progestagens, and Gonadotrophin-releasing Hormone (GnRH) analogues have allowed breeders and veterinarians to better control and manipulate the mare’s reproductive cycle towards more successful breeding and pregnancies.
• Transrectal ultrasound scanning has proven to be an imperative tool in monitoring follicle growth, endometrial architecture, and ovulation. This intervention allows accurate early pregnancy diagnoses and helps manage twin pregnancies, thereby enhancing breeding efficiency.
• Moreover, both flexible videoendoscopy and rigid laparoscopy have advanced the monitoring and treatment of both physiological and pathological changes in the uterine endometrium and oviducts.

Disease Outbreak and Change in Hygiene Practices

• The article recounts the outbreak of Contagious Equine Metritis in Newmarket in 1977, which led to significant changes in the management of both mare and stallion. This included improved veterinary hygiene methods and sample collection processes, which have since influenced breeding techniques and strategies.

Overall Impact on Breeding Efficiency

• The authors conclude by appreciating the technical and therapeutic advances over the past half-century, which have greatly enhanced the diagnostic and treatment capabilities of veterinary surgeons on stud farms. The result of these advancements is a noticeable increase in the breeding efficiency of Thoroughbreds and other types of horses.