We live in MN, it hasn't been above 32 in over a month. Most days under 20, sub zero nights.We have 4 EE that are about 9 months old. They are proving to be very poor winter layers, we get one egg a week from them. Some days none. Before it was cold most days we would get 3-4 eggs from them. The rest of our flock are about one year older than the EE's. They are RSL and one Dom, they are all going through their first moult. Only 2 of them are laying right now. Their first winter they were great layers, seemed like nothing slowed them down. Is this common for EE in the winter? They are in an insulated un -heated coop with a light on a timer, it is on most of the day, turns off at night.