Hey folks. I am at 9250 feet above sea level in Colorado. It's been a chilly winter here, as with most places north of me. I have a small flock of 8 hens (mixed flock, all layers) and a BO rooster. Until this weekend my flock has been with natural light, this weekend I placed a light in the coop. They are fed fermented layer mash. And have a large run to be in on the sunny days. For the past 2 months I have not seen a single egg. Aside from lighting, which is now in place, can anyone suggest how to bring back the laying before spring arrives?