We have 6 chickens, all different breeds, who are about 9 months old. We got them all at the same time as day old chicks. Juno, who is a partridge rock, has her butt constantly pecked by the rest of the chickens. The first time it happened I isolated her, cleaned up the wound and used blu-kote. Once she healed I reintroduced her to the coop and everything was good for about 2 weeks when I noticed that her bottom was bloody and she was constantly being pecked again. I isolated her again, cleaning and using blu-kote until she healed. As soon as I brought her back to the coop the other chickens immediately started pecking at her butt again. She's at the point now that she squats and allows the other chickens to peck at her. I'm at a loss as to what I should do. Any suggestions? Thanks.