well, our old old hens stopped laying a few weeks ago for some reason. We didn't know why at first. They have Scaly Leg Mites, which we are gonna get rid of as soon as possible. Then I found something that someone said about these nasty buggers: "They(the mites) may cause long term reduction of egg production due mainly from the stress of frequent irritation, but that's about it." So THAT'S what must've been bothering the poor old ladies!