- no such thing. The epididymis does not create testosterone. The Male Horse: Does Gelding Improve On Stallion Behavior? Mirror KB Article - Gelding: A Stallion's Altered Ego
And a vet discussion forum HorseAdvice.com Equine & Horse Advice: Proud Cut
If he is acting stallion-like then its: a) learned behavior or b) his adrenal gland is creating excess testorone. cryptorchidism
- is an undescended testicle. Which rpdices non-viable sprem (because of the body heat of the horse) and testosterone. Requires surgery and depending on how far the testicle is with in the cavity of the abdomen depends on the price. Cryptorchidism - Wikipedia, the free encyclopedia
As long as no testicle is apparent the horse cannot get a mare pregnant- though some claim that a very very small percentage of cryptos can.
Afffecting performance depends on his training. Stallions can preform quite well as long as they handled and trained correctly. They take more time and need a more active handler-rider as they are always being doused with hormones (testosterone). Same as a proud cut horse.
Only way to tell for sure is to get a blood test as was mentioned.