sentences:  There is debate over whether to remove the undescended testicle in a stallion; some people believe it causes discomfort to the animal, others disagree.Proponents of surgery note that it is low-risk, and the undescended testicle is non-functional, and it can be removed with laparoscopy or a very small incision.Some stallions show improved behavior and athletic performance when the non-functional testicle is removed.