I have been told two things. #1-They won't lay eggs until you start them on layer feed. Right now, mine are still eating "Start & Grow" feed. I thought I'd let them finish the bag before I switch them over to layer feed. The Buffs and RIRs are about 19 weeks. The Barred Rocks turned 16 weeks old on Monday. #2-I have been told that you can't eat the eggs, if the hens are on medicated feed. I've gotten mixed opinions on both comments. Anybody know for sure whether or not chickens will lay before being given layer feed and if the medicated feed produces inedible eggs?