I raise mostly rare breed large soft-feathered fowl and find that if I time it right the first hatch of the year will start laying about now and carry on until they moult the following summer. I don't set eggs until lambing's finished, though, so if we decide to lamb late it doesn't work out. We keep birds for only 18 months then sell them on, as we find young birds cope best with our exposed hilltop. I prefer not to give additional light.