We have a small flock, 3 roosters and 7 hens, various breeds. The roosters were starting to fight, so we had the two less dominant roosters for dinner. The hens are 8 months old and laying now. We found blood in the coop after the roosters were taken care of, but then witnessed one of the hens peck the comb of the rooster and it started bleeding. Why would she do this and how can I prevent it?