Quote Originally Posted by GrifTheGreat View Post
I'm not an expert and do not know of any proven info that that states that they are barren or steril. it is believed that they are mules, but like I said I do not know of any proof. It is just belief as far as I know. You could still try, but mules show no interest in breeding sort of like they lack those specific hormones and therefore do not feel the need to breed. Someone has possibly tried to brred them and that is more than likely where they were labled mules. Could have been a failed attempt though. If there is scientific proof I haven't seen it yet.
Wish someone here could shed more light on this.