Before the "polar vortex" last week, we were averaging 11-13 eggs a day from our nine month old 13 Barred Rock and 3 Americauna's. Their coop is enclosed, but not insulated. Since the cold snap, I have been getting 1 - 3 eggs a day. I understand and expected the production to drop due to the extreme cold, as their energy was needed for staying warm and alive, but I expected production to have returned to normal by now. I have not been using light in the coop, as it was my understanding that pullets were not as affected by this and production was fine. Suggestions or experiences to share??