3 of my 11 girls have lost feathers in a ring around their neck. My Buff Brahma looks the worst while my 2 Buff Orpingtons only have light feather loss with healthy looking skin underneath. The brahma's neck looks really rough. They are all eating fine and seem content...i've looked for parasites and don't see any. I've never seen them picking at each other. Is this something I should worry about? They are eating normal layer feed pellets, a cup of scratch grains and also a handful of whole corn and a chunk of bread as treats. Their water gets changed daily and most are laying daily. Their combs are red and they seem healthy and happy otherwise. Picture 1: Orp #1 (Sam) - missing feathers in front of her neck Picture 2: Buff - missing a complete ring of feathers around her neck Picture 3: Another shot of Buff and Orp #2 (Ella) below her with a complete ring of missing feathers around neck.