I live in Michigan. It get's dark by about 5:30PM and doesnt get light till about 8AM. It's been below freezing for at least the last week (if not longer). My easter egger hasn't laid an egg since 10/23/13 and today is 12/13/13. That's almost 2 month! My 3 ISA Brown's lay every day and haven't missed any days. All my chickens were chicks last March. So why hasn't the easter egger laid an egg in about 2 months? I haven't changed anything (type of feed or anything). Help.