Hi all, we have eight chickens 3 BR's, 3 EE's all 18 weeks and 2 BLR's that are 14 weeks. From reading previous posts I understand that I should leave all the girls on grower (we use Scratch and Peck no soy/corn grower) until all are of laying age, please correct me if I misunderstood. With the 6 18 week old hens should they have access to Oyster shell? Also will it hurt if the 14 week olds eat it as well since I planned to offer it free choice in a feeder? Then once they are all laying we should switch to Layer correct? Sorry for so many questions, these are our first chickens and we want to get it right.