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If you have a light on them, I would turn it off or at least get a red bulb. Also make sure you dont have too many in a small enclosure, sometimes putting a "flock block"in the pen will help...the number one thing is letting them free range during the day. Sometimes once they start they just wont stop..especially the cockerels..you may have to put each individual bird in its own pen for a month or so, to break the habit.
What is a flock block? They are in a chicken tractor on the lawn, with no artificial light.
Do you have too many birds in the tractor? If the birds are way over crowded it will cause feather picking...
Purina makes a block that is like a cattle salt block, the chicks peck on it instead of each other....gives bored birds something to do......I would also seriously consider free ranging them during the day.