I've been dealing with my chickens feathers being broken off for months now. I initially thought it was protein content but I had them on 25% protein feed for a while and it wasn't working so I reduced it back down to 18% because my ducks eat the same feed and I diddnt want the protein to be too high for them. Then I thought it could be mites or lice, even though I haven't seen any, so I treated for 3 weeks with poultry dust and that diddnt work so I tried the seven dust and no luck. The feathers are getting worse and worse, now I am sure it's feather picking because I have seen it. The problem is out of my 8 chickens all but like 3 I have seen doing it. They have enough room and also get to free range. How can I stop them from doing this? Or do I just have to cull and start over? I just finished my first quarter or nursing school and am on a break so I haven't had time to figure this out until now. Any help is greatly appreciated.