I actually dont know, I have never bred them back to anything outside of other fainters, I would not think so. Even with fainters, it's not like they constantly faint, with age they learn to control it and they seldom faint, normally they just sort of lock up and look like they have a cramp. My older goats I have now, can stand my two year old running around and they dont faint so I think it has alot to do with human contact.