I have a flock of 18 chickens. I’ve had them since they were newborn, which was in February and they were looking really good. All their feathers were gorgeous. Now they look like they have been mated buy a rough rooster. Their back and saddle area is old trashed up in their feathers are Picton look eaten? I’ve checked around their Vance there’s no lies there coops been sprayed, what could it be?