The theriogenology program at Louisiana State University’s (LSU) School of Veterinary Medicine manages reproduction in its clinical practice and reproductive research regarding horses, dogs, and other animals. According to Dr. Dale Paccamonti, professor and service chief of theriogenology, and Dr. Sara Lyle, an instructor in theriogenology, approximately 65% of the program’s patients are equine, 25-30% are canine, and the remaining 5-10% are other species such as cattle, goats, and sheep. Dr. Bruce Eilts, professor of theriogenology, and Drs. Soledad Ferrer and Etta Bradecamp, residents, also work with the program.

Mares are brought to the School’s equine clinic for a variety of reasons, such as embryo transfer, breeding management, infertility, and artificial insemination. Stallions are also evaluated for fertility problems, semen-freezing, and for shipment of fresh-chilled semen. According to Lyle, mares are seasonal breeders and typically ovulate between April and October. However, most breed registries and horse owners aim for a birth date of January 1. “The goal is to have foals born as early as possible in the year,” said Lyle. This ensures that foals born in a particular year will compete in racing or other competitions will be approximately the same age and size. The theriogenology unit conducts research to determine how the pattern of cyclicity (ovulation) can be changed to meet the desired birth date. “One area of research studies how we can modify the transition period in the mare to get her to ovulate and foal early in the year,” said Lyle