We have 2 8 week old cochins and a 7 week old EE. We are starting to merge them with our 5 leghorns that have been laying for at least a week. We keep the older ones in the coop while the little ones have the run. I hope we can integrate the newbies at 10 weeks old. Since the older ones are on layer feed, the little ones will be on grower of course. Do I just have to trust that the younger ones stick to their feed and the layers stick to layer feed? Or can the layers eat grower but the younger ones can't eat layer?