sentences:  Usually both testicles in a horse have descended by the age of 16 months, but as many as 15% of all two- and three-year-old male horses may have a retained testicle.An example of a ridgeling that was gelded was the Kentucky Derby winner Funny Cide.While the horse was gelded because the undescended testicle caused him noticeable discomfort and his manners also improved after castration, his success in horse racing has led to considerable discussion over whether it would have been better to opt for surgically correcting the condition instead.