My chickens look scragly. They have feathers out of their heads and the feathers on the rest of thier body don't look so good. What could be the problem and how to fix it? They don't lay real well either. One day 0 e g g s then 2 then 5 or 6. Could it be worms or something. What do I need to treat them. 2 are silkies. 4 bantams and 5 ??