I would try giving them a higher protien feed and give oyster shell on the side. My flock ways about 22% protien at all times. Mostly so I can feed everyone the same thing (chicks, poults, turkeys, chickens). I haven't seen any feather picking in my group.
Higher protein is always a good start but once feather-picking starts w/a hen I hear it's hard to break them. I feed my flock well with higher protein organic mix, supplemental proteins in the form of canned/cooked meats, vitamins, fresh greens, free-ranging, etc etc. But my Cuckoo Marans was feather-picking our Silkie on the roost. I thought the Silkie was molting since I never had a Silkie before. But when we got another Silkie pullet and she started missing feathers (too young to molt yet) I figured what was happening and felt so bad not recognizing there was a culprit in the flock. We had to re-home the Marans. A 2-lb docile Silkie or any docile/timid breed is easy-pickin's for a 7-lb Marans. My friend took our Marans into her layer flock of large dual-purpose less-docile breeds and the Marans was no longer able to dominate others. I miss the brown eggs but couldn't keep the feather-picker.
This was our fluffy Silkie at 6 months old
This is what the Silkie started to look like after adding the Marans to the flock.
This is the ultimate damage done to the Silkie on the roost, including her comb chewed off which never regrew but she did get her feathers and crest back. Her body took a year to re-grow her full feathers again in which time she ceased laying eggs during that time.
It's always been tough for me losing chickens because of death, or having to remove feather-pickers, or re-home bullying hens, but in the interest of peace in the flock I had to make some tough choices. I don't have the luxury of space to separate out trouble makers in separate areas. Good luck with your feather-picker and if something works for you to stop it let the rest of know!!!
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