I have a flock of 7-8 month old hens that free range most days and that I started on layer feed with extra calcium at 6 months. They also get daily treats of sunflower seeds, millet and corn mix as well as occasional bread of table scraps. One or two hens will lay one or two eggs a day that's it! No one else has done a thing! I have 3 EE (the suspected layer since the eggs I do get are blue), 1 Welsummer, and 2 Black stars. We are in North Carolina so our winter has been mild and there is still plenty of green and bugs when they free range. They show no signs of molting, or broodiness, or illness of any kind. They also show no sign of interest in laying eggs!!! I just don't know what more that I can do.