I’ve made The feed switch before the first egg was laid when I was finished with a bag of starter/grower and we were at 22-23 weeks. All the signs were that laying was about to start And I didn’t want to have 50 lbs of feed I couldn’t use. If I recall correctly, everything went fine and they started laying pretty quickly. But I’m with you...weeks 16-24 were awful. First egg today? Today? How about today? Then whammo! It happens.