I have been reading about protein levels in feed. A lot of opinion about what to feed. I have read that roosters need 9 - 12%, layers 15 - 17% and chicks 19 - 22%. I would like to know what you feed. At the present time none of mine are free ranged, so address if you would for them. While I do give them some additional things from the home and garden, I would like to know what you would feed them if they were strictly on a processed feed diet.
Adding to the comments - my vet indicated that high protein levels can interfere with calcium absorption and that oyster grit is not readily bio-available.
Sorry to say I don't know what that protein threshold is for chicks/hens/roosters. I do know that even though free-ranged and supplemented with balanced grains and oyster grit, my flock always shows enthusiasm for more protein in their diet ie meat or worms etc.
The oyster grit discussion was relative to a young hen that lays jumbo size eggs, the shells of which are thinning out. It was recommended to provide calcium carbonate to her such as a pharmacy offers for women. I believe there is also a calcium syrup, for animals? Which I haven't researched.