Not to hijack your thread, but I had a similar question. I have 8 week old pullets (layers, not meat birds) and I started them on kalmbach non-medicated 18% chick started feed. A few weeks ago my feed store was out of the kalmbach so they suggested McNess 23% chick/duck starter instead. I didn't realize till last night that that's typically a feed for meat birds. I googled whether it was ok for my birds and most websites said that's too much protein and can damage their kidneys. Then I come here and everyone is like "the more protein the better!"

So which is it? Do I need to rush out and change their feed to a lower protein or are they fine at 23%? Should I change it as they get older?
Also, if it makes a difference, I've been fermenting their feed from the start. They LOVE it and can't seem to eat it fast enough. I also have them in the run most days which has a dirt floor half overgrown with weeds at the moment, so they're able to forage/free range. Once they're old enough I'll let them out to free range on 5 acres. Will more or less protein matter then?
Thanks for any advice.