I agree, feed a Non-Medicated Starter-Grower or a All-Flock/Flock Raiser feed with 18 to 20% Protein with Oyster Shells separately.
I Offer Oyster Shells separately after 15 weeks. The Pullets will take as needed.
I don't even have Cockerels/Roosters and those are what I feed my hens 23 months old.
A recent collection of eggs.
Feeding this way is good for all ages, although I do feed a Medicated Start and Grow for the first 10 weeks.
My latest addition.
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5 ISA Browns, 12 weeks old. GC
I Offer Oyster Shells separately after 15 weeks. The Pullets will take as needed.
I don't even have Cockerels/Roosters and those are what I feed my hens 23 months old.
A recent collection of eggs.
Feeding this way is good for all ages, although I do feed a Medicated Start and Grow for the first 10 weeks.
My latest addition.

5 ISA Browns, 12 weeks old. GC