Ridgling

[4] Although the rate that testicles descend varies between individual animals, horses over three years with the condition are generally castrated.

Surgery called a cryptorchidectomy is used to remove the retained testicle, but different procedures are used, depending on the location inside the body cavity.

[7] When a male horse thought to be a gelding exhibits aggressive or sexual behavior, cryptorchidism is suspected.

[4] As a young male animal reaches puberty, the testicles, which originally were inside the abdominal cavity, move down the inguinal canal to the scrotum.

[citation needed] A number of notable racehorse stallions were ridglings, including Honor Code, A.P.

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.