My chickens are backyard chickens with a large yard to free range in daily. They get locked up at night also. I think it has to do with the lack of natural light as the reason they are not laying yet= at least I hope so. Hopefully, as the days grow longer, the eggs will start coming. I have 6 chickens - a Buff Orpington, a Cinnamon Queen, an EE, a GLW and two bantams: one SLW and one BLR Wyandotte. So far, I get one egg per day if I get any. I average 5 eggs per week. The oldest chicken is the BO, she will be 2 in April and is usually a great layer, but had a long molt this winter. Most of the others are 9 months old. the EE and the Bantam BLR Wyandotte are the babies and are 71/2 months old. Only one laying is probably the SLW bantam- the eggs are small. It is really disappointing, but I am betting it is the light. they get veggies and high protein snacks- mealworms and BOSS daily. I had been feeding them Grower Developer feed, but when I started getting that egg, I switched them to Layer thinking since they were old enough and mature enough, that is what they would need. Now, I am not so sure.