Originally Posted by BansheeBabe
myhorsesonador - viable sperm cannot survive the high temperatures within the abdominal cavity, hence the need for the scrotal sac. It keeps the testes at a cool enough temperature for sperm to survive. If the horse has been gelded and both testicles removed then no, there is no chance he can impregnate a mare.
It's highly unlikely but it does happen. Just like some cryptoids can inpregnate a mare.
I know this from exsperinace so just take my word for it. It's not worth the chance.