Just a quick note... I have chicks, layers, broody's, molting, and roosters.
I feed "flock raiser"... which has 20% protein and 1% calcium. This meets the needs of my entire flock as long as I supply oyster shell or another calcium source on the side for the active layers.
If you have light bodied layers like leghorn, once mature (laying) they would be fine if you choose layer feed (*usually 16% protein and 4% calcium). If you have heavier bodied or so called dual purpose breeds, 18% protein minimum will serve you best.
Never go beyond 30% protein as that IS too much for chickens and *can* (doesn't mean will) cause gout and kidney failure if fed LONG term. The same is true for birds not in lay should not get more than 3% calcium. Both (can) cause different types of gout/kidney failure. Plus fat hens lay less and suffer more from internal issues.
That's a HUGE minimum!
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