I have a little flock of 16 hens that I purchased as day-old chicks in April, I believe. No one is laying and I can't figure out why. I'm feeding them Dumor layer pellets, the same as I fed my hens last year who were laying like crazy. The only thing different is that these hens are not free range, but are in a pen that's about 1/4 acre in size. I was getting an egg about once or twice a week a few weeks ago, but I think that was from the one hen that I still have from last year. Why am I not getting eggs?!