I posted on this before, but I want to revisit. ALL of my hens have naked backs. Some are beat up more than others. The one rooster we have, his butt is plucked pretty good, as is under his neck. They are getting a feed that is 24/26% protein, in addition to free will oyster shells. They pluck at each other at various times - when they are roosting (we have a tiered roost) or just for the heck of it. Any thoughts on how to get them to stop?