Raw Exposed Skin - Broken / Weak Feathers

[PredatorMilk]

12x laying hens of varying but generic breeds. Six birds that are under 2 years old, six birds that are various ages and older up to 8 years. All birds are affected And all birds have been living together for more than a year.

Bare skin is exposed in spots, feathers there are broken off, skin becomes raw. Feathers do not grow back. All remaining feathers are brittle and dull.

Presented with one bird about a month ago, all birds know affected. All birds are eating and drinking and defecating normally.

Want to help the birds get back to their best healthy selves and have health feathers again.

Looking for advice or insight as to proper treatment. We are cleaning and sanitizing their coupe and considering and ivermectin drip .

See attached photos.

Thanks a million!

 

[nuthatched]

What are you feeding your birds?
How many birds are in that coop and how big is it?

 

[pennyJo1960]

I will ask the same question how many how big is the coop ?

 

[PredatorMilk]

Thanks! 12x birds. Large run (at least 6ft per bird) and most often free range (back yard chickens). Feeding Ag-Land of the Rockies Layer feed.