I would also look for an "all flock" food. There are a few different brands commonly carried and generally range from 18%-20% as others have mentioned. Purina Flock Raiser specifically says it can be fed at all ages whereas I believe the Nutrena Naturwise and the Country Feeds all flock say that they are for adult bird on the bag. In any case, the nutritional analysis is slightly different from a layer feed. A grower feed is a good option as well.
If you want to compare specific feeds you can look them up on @Texas Kiki 's feed comparison chart. At the bottom are tabs to select all flock or layer or whatever.
https://docs.google.com/spreadsheet...3Bt5CUQfX1PlTEhg799sDT-qM/edit#gid=1546502806
If you want to compare specific feeds you can look them up on @Texas Kiki 's feed comparison chart. At the bottom are tabs to select all flock or layer or whatever.
https://docs.google.com/spreadsheet...3Bt5CUQfX1PlTEhg799sDT-qM/edit#gid=1546502806