I bought 3 of my hens (as day olds) May 15th. Which would make them just under 6 months old. So where are the darn eggs? Shouldn't they be laying by now? They have a nest box in their coop and tractor. They do free range sometimes during the day but between the dogs and I, I'm sure we would find an errant egg. They are getting oyster shells and pastured so I imagine their diet is full and complete. Although they are still eating the grower feed because they live with 3 sixteen week old Buffs and I was told the extra calcium is not good for growing chicks.They are Barred Rocks and Speckled Sussex. I was told this were good winter layers. Any thoughts?