I have 52 chickens; 7 roos and the rest hens. They have been together for the past 3 years and had been getting along fine. For the past month or so 4 or 5 of the hens have been picking on each other and the other hens; pulling out feathers, pecking their backs until bleeding, chasing hens from the food. I have no idea why they are acting like this. I've added another roost pole to give them more room but they are not overcrowded without it. I read on another post they might need more protein but I give them 2 dozen scrambled eggs every Saturday and Sunday mixed with cheese and oatmeal. Any suggestions? Thanks.