My husband and I ranch in central South Dakota. It gets extremely cold here in the winter (frequent days/weeks in single digits or below zero).We recently added laying hens to our ranch (this past summer). We used an insulated shed for their coop, and my husband built them an outdoor run. We originally fed them layer feed and some oyster shells, and then placed a scratch block in their coop, and they did very well. When very cold weather hit, we bought them a heated waterer, but lost two chickens right away. We then added a heat lamp to the coop, and on the recommendation of a friend, upped their scratch grains and added feather fixer. Anyway, we haven't lost anymore, and they are eating/drinking well, but they still look a bit rough and they haven't been laying many eggs. Any additional tips for helping laying hens maintain their health in very cold weather? Should I be altering their coop in any other way? Feeding something different? Thanks in advance!