Have a few weeks to go before this is an issue, but here is my problem. I have 7 Buff Orpingtons that are 12 weeks old. I have 3 Rhode Island Reds and 3 Barred Plymouth that are coming up on 6 weeks old. Soon when the Orps start laying, I need to switch to layer food. But the youngsters need to stay on starter. Do I need to keep them segregated until both batches start laying? I was hoping to integrate them sooner than later. Any suggestions?