Help! I have 2 coops of chickens. In 1 coop I have 23 hens and a Rooster. Many of the hens have their entire butt showing with no feathers. Now a couple of them are also missing neck feathers. My welsummer looks like she might be losing them on her chest as well. Other than that they seem perfectly normal. They are laying eggs like crazy and are all active and healthy. I put vinegar and garlic in their water. DE in the next boxes. I have sprayed them all with poultry protector a couple of times. Deep cleaned the coop and sprinkled DE and sprayed Poultry Protector all over. They just seem to lose more feathers and look awful. Is this much feather loss a sign of overcrowding or is there something else I am missing? In my other coop the girls are all healthy. I welcome all suggestions!! thanks!