I have all my chickens and chicks together: 18 pullets at 20 weeks, 8 other pullets at 13 weeks, 1 pullet at 10 weeks, and 26 mixed hens and roos at 6 weeks. I'm going to start my older 18 on layer feed since they are at 20 weeks, and I'm wondering what to do about the younger chickens in the coop with them. Can they eat the layer feed, too??? What should I do????