I purchased 150 chickens from a neighbor this December and decided to run them in Salatin style chicken tractors. They are 8x8x2 ft with roosts and nesting boxes. I put about 20 hens in each tractor. It's pretty great using them to prepare the garden area. But unfortunately I have been dealing with loss lately. In winter I could prop the tractors up in the late afternoon to let them come out and play. But now with my garden getting started I confine the layers to the tractors. So I guess this is the crowding and boredom issues others have expressed. It stinks to go out there and find one dead every few days. They peck either the back or butt and once blood is drawn they are relentless. I invested a lot of money and time in building these tractors does anyone have any suggestions? I also mix my own grains and thought the behavior could be from not enough protein. Any thoughts or suggestions welcome!