I have ten RR hens and two rosters. All but one of the hens has lost the feathers around the tail area, both top and bottom. I can't say mostly on top or bottom about the same. The areas are very red. Even the dominate roster has a bald spot on his bottom.
Not knowing what to do I have sprayed all of them with Blue Kote.
Can anyone tell me what might be the cause and a solution?