Mites, Pecking or Something Else?

[GillerInstinct]

I have attached a couple pictures of my salmon faverolle. She has missing neck and butt feathers. They’ve been missing since February but it’s recently gotten worse and she stopped laying. She eats fine and acts normal. Is this mites/lice, pecking or what? I know she self pecks her neck on occasion but it’s getting out of control. Any advice would be great. Thanks.

 

[sourland]

Both she and the Barred Rock look to be feather pecked/plucked.

 

[GillerInstinct]

Both she and the Barred Rock look to be feather pecked/plucked.

Any advice on stopping the pecking?

 

[nuthatched]

Any advice on stopping the pecking?

How big is their coop and run for how many birds? Diet?

 

[GillerInstinct]

How big is their coop and run for how many birds? Diet?

7 birds. Run is 90 square feet. Coop is 6x6 by four feet tall with a roost. I let them free range in the afternoons and I don’t often see them peck each other. All my chickens but one are missing their butt feathers. All the chickens lay normally except this salmon faverolle.

 

[HylineChookChooks123]

Parasites or diarhoea, which diarhoea is caused by parasites. You should probably give them 3 drops of liquid ivermectan in their water