I own 2 studs. Judge is my oldest. Got him as a yearling. judge was trained that when he is out working(riding) he is not to speak at all. Because i have trained him corrctly i can take him to a show I can tie him right next to a mare in dead heat and he will not even look at her. I walkk him around in a rope halter, lead him with a loose rein. BUT when he is at home and turned out then he can talk, siff, play all he wants.
He wears a rope halter when its work time and when its time to breed she wwears a nylon halter with a chain. not looped or over the nose, just snapped just like reg. lead.

If you train them right, they do not give you a problem at all.