we have put lights in each of our coops and generally get one egg for each hen a day. My question is its been very cold lately and my eggs are not hatching since the temperature has been below freezing. We collect the eggs twice a day so they do not freeze but they will not hatch. There coops are in three sections, they have a laying quarters, a feeding quarters and an outside run. We feed them a mix of laying mash, scratch, oyster shell and twice a week we add ground dry cat food. But still no babies in the incubator. Any suggestions?