My chicks get fed only Medicated Start & Grow for 10 weeks.
At least 4 of 7 Barred Rocks are laying at 22 weeks. .GC
ETA; Grit yes. I offered them Chick Grit at 2 weeks mixed in feed, 1 1/4 pounds to 50 pounds of feed and Poultry Grit separately around 7 weeks.
When outside they would eat...