For the males, this establishes if they are suitable for breeding, the bullfight, or slaughter for meat. The testing for the bullfight is only of their aggression towards the horse, as regulations forbid their charging a man on the ground before they enter the bullfighting ring. They learn how to use their horns in tests of strength and dominance with other bulls. Due to their special aggression, these combats can lead to severe injuries and even death of the bulls, at great cost to their breeders.