I have 20 week old leghorns and EE's and 18 week Buff Orps. 1 leghorn is laying and the others will be any day, but the EE's and BO's aren't showing any signs of laying any time soon. Can I still feed them all grower feed and just offer the leghorns oyster shell until the others are laying? Or should I move them all to layer feed? They all use the same feeders so I don't know how to keep the younger ones out of the layer feed and the layers out of the grower feed. They are all in a big 1/8 acre yard with plenty of bugs, weeds, etc. to eat. The one egg we have gotten so far had a well formed shell. So I assume she has had enough calcium and such. What would you suggest I do?