Losing feathers

[Nek]

My chicken seems fine. Otherwise, she’s eating and drinking and passing all her food, but about three or four weeks ago, she lost the majority of her feathers on her underside, and I can’t figure out what’s wrong. Someone suggested spraying her with blue-kote, but I can’t imagine why/how that would help. I’m wondering if anyone has any suggestions about the root cause of this and a possible solution? Any help is appreciated.

 

[nuthatched]

What's her diet? Have you checked fir mites or less?

 

[Nek]

I have checked her and the other three of my flock for lice and mites and found none but treated them anyways. I try to keep their coop impeccable. I just did a complete spring cleaning a month ago. Full litter change, spray down, diatomaceous earth… The whole works. They’ve always been on ACV water and they eat layer crumble. I also toss in the occasional handful of BFL.

 

[Nek]

Has anyone seen this before?

 

[21hens-incharge]

It could be from roosting.
What kind of roost do you have?
It's possible the feathers are getting worn off while she sits on the roost.

 

[Nek]

Does that happen?