Use of manual stimulation for collection of 
semen from an atactic stallion unable to mount

Sue M. McDonnell, PhD; Malgorzata A. Pozor, Lek Vet; Jill Beech, VMD; Raymond W. Sweeney, VMD

(First Paragraph)
8-year-old Thoroughbred stallion was donated to the University of Pennsylvania because of ataxia that rendered the horse unable to breed. The horse had a history of having raced and of having been retired at age 4 after a long, debilitating illness. Details of the illness were unknown. Since the period of illness, the stallion had displayed an awkward gait and abnormal standing postures, and leaned against the walls of the stall. Musculoskeletal or neurologic evaluation had not been performed. The stallion had been bred to a few mares for each of the preceding 4 years, showing normal sexual arousal and response. However, he had become increasingly clumsy and eventually had become unable to remain mounted on a mare long enough to ejaculate. The most recent successful breeding had been 1 year earlier, at which time, and during subsequent attempts to breed, the stallion fell off the mare while mounted. A variety of techniques had been used without success to assist the stallion in breeding, including handler support, stabilization of the hindquarters, and use of an artificial vagina while the stallion was standing.