It has been discussed here about different famous TB stallions who were mono cryptorchid. A.P. Indy. I ‘think’ American Pharoah as well.
I thought I read here - someone posted they do a surgery - maybe even before the horse is sent to the yearling sales? Or not?
What surgery would this be? Removal of the undescended testicle?
Surgery plus hormone therapy to encourage the testis to drop?
TIA for info on this. 
