An alternate definition of ridgling is a partially castrated horse. Bayern is a bay ridgling bred in Kentucky by Helen Alexander. In some countries, an incompletely castrated male is known also as a "rig" or "ridgling". A.P. Indy was born a ridgling, meaning he had one undescended testicle. Summer Squall was a ridgling, meaning that he had an undescended testicle. Like A.P. Indy, Court Vision was a ridgling, meaning he had one undescended testicle.