I have 21 chickens. A few are obviously moulting, with feather loss and new ones coming in around the back and neck. However: 1. Some have very frizzy, dingy/dull and thin feathers. 2. Some have bald patches on their backs mear their tail feathers (skin showing). Needless to say, egg production is down from 14 a day to 4 a day. 3. Combs slightly purple on a few. I put DE around the run and coop (twice), use a tad of vinegar in their water. 4. A couple weeks they were restricted to cooked beans and table scraps due to their normal feed being available. 5. Some feathers look like someone cut them with a pair of scissors. Any help is appriciated. Thank you!