So about a month ago my layers were giving me a good 13-18 a day. Not spectacular (there are 50 birds 20 weeks or older), but decent. Then we had a ridiculous cold spell, temperatures lower than had ever been recorded. The run/coop was well protected, so I don't think they got blasted, but after 2 days of cracked frozen eggs, I have had nothing more than 4 eggs a day since. Why 4? They all got whatever stopped the rest from laying. Its been a month now, and production has not recovered. In case you are wondering, they have had lighting to simulate 15 hours a day since winter began. Any suggestions?