I have 8 Barred Rock hens, 4 are between 2 and 3, 2 are a little over a year and 2 are about 8 months, all are laying good, but none seem to want to go broody. I have 1 hen that stays on the nest for a few hours at a time, then she will leave after laying her egg. I tried putting eggs under her and she tuffed them under her, but then she left them. Is there something I can do to intise them to set? I'm wanting chicks and not having much luck with the incubator, of coarse a lot of that could be my incubator, I'm getting a new one.