I have read that chicks should go on layer feed once they start laying and not before. Is this correct? I have six hens that are 16 weeks old, not laying yet. I am in the process of integrating 21 seven week old pullets. I am assuming my 16 week olds will start laying in the next month. In that time I will have a few more chicks that will be 7-8 weeks old and starting to integrate in with the big chicks. Is is ok to keep ALL of them on chick feed, even though my big chicks will be 20+ weeks and possibly laying? Is leaving a bowl of crushed egg shells sufficient enough to supplement my (hopefully) laying pullets? Separate feeders with layer and chick feed isn't going to work with my coop set up. I'd have to separate my flock and I really want to keep them all integrated.