I have a mixed flock, no roos, but older ladies slowing down in laying and pullets not yet laying mixed with active layers. I feed grower feed to the whole gang and provide oyster shells, crushed eggshells, and grit in the coop at all times for whenever they need it. For years I went back and forth using layer feed when I had only layers then switching to grower when integrating new pullets. No more! Grower feed year around for all now and they’re thriving.