I know you guys will think this is BS, but....... I had a bunch of chickens, and NO rooster that looked like that. I asked the ol' man what it was, and he told me it was lack of meat. No kidding. So I did what he said. I killed a cottontail and peeled the hide back to expose the meat and hung it in the pen. They peck on it, and leave each other alone. This time of year you gotta change them out often.....grin

I thought it was BS, but after hanging a few rabbits, a couple months go by and they were feathering right out without it ever happening again...