I gave our chicks the Purina Start & Grow (medicated) feed until they were about 10 weeks old. I wanted to get them off the medicated feed as I read it was beneficial for them to develop their own immunity to coccidiosis; but the only unmedicated feed I could find that seemed appropriate was this "Grow & Finish: from 5 weeks to market age" at the feed store... seems targeted at "broilers", but they have been eating it fine for the last few weeks and seem to be thriving. (They also have good access to our yard, grass, etc & some kitchen scraps.) I probably wouldn't have thought twice about it, but a lady at a poultry farm we visited (a pretty big, not-free-range at ALL) operation, seemed to think I was crazy & said they needed to be on the Start & Grow until they were 5 months old... so now I am wondering. Thoughts, anyone?