Added three 6 month old hens to my flock of 10 six month olds, the 10 established hens are being very mean to the new ones, pecking them, not letting them in the coop, stealing food, just randomly attacking them, chasing them all over the place. Even my bottom of the pecking order bird is being very mean and aggressive to the new ones. Is there anything I can do to get them not to pick on the new hens? I am thinking of just starting to eat them...