I have 25 Australorp hens, 2 dorking hens, and 2 Orpington hens. It is the dead of winter here in Western Canada, and my ladies have all but stopped producing eggs! We have installed a light (bright enough to read a newspaper) in the coop, on a timer that gives them 14 hours of natural light a day. They have oyster shell supplements, a lovely coop, they free-range all day on 5 acres, and they should be HAPPY. Any suggestions as to whats going on? They were born last spring and summer. My only thought is that they have had mites, but we've treated them extensively. They seem fine in that regard.