The stallion’s reproductive tract includes two testicles, housed within the scrotum, and the accessory glands (i.e.: prostate, seminal vesicles, ampullae, and bulbourethral). Male horses achieve sexual maturity around 15 months of age. During breeding, stallions may be prone to penile trauma and infections. Stallions may be castrated or gelded (surgical removal of the hormone producing testicles) around 1-2 years of age to avoid unwanted behaviors. Older horses may develop tumors within their reproductive tract.