I have a new mixed flock of birds appox 5 weeks old. I have no older birds. My sole Production Red has a strip of missing feathers along the side of his neck that is only apparent when he stretches his neck out. The skin does not look raw. I have not noticed any of my flock of eight birds pecking aggressively at each other or a particularly dominant bird yet. I suspect it is just part of the feathering out process as opposed to an injury or disease. Does this sound plausible?