Turkey losing feathers on wings

[Wrensway]

I searched the forum for this and could not find anything on "wings" I have 4 Bronze Turkeys and I have noticed them losing the feathers on their wings. The Quills are still there they are just stripped of the fine hairs that should be there. One Turkey only has a little loss but one of them has nothing but the long quills left on her wings. It only seems to be the wings that are affected. Any ideas? They are in with the Chickens and none of the Chickens are showing signs of losing their feathers. I do let them free range daily so I think they are getting enough protein. The Turkeys eat the same Chicken Layer feed along with table scraps the Chickens eat.