Well, let me just confuse the whole thing for all of you...
I make oyster-shell and grit available free-choice to all but the Marans, who get eggshells for their calcium.
Once a month I add liquid calcium to all waterers as a systemic, more absorptive boost. You can find it in the goat section of the feed store.
I feed Resolve Farmer's Helper Ultra-Kibble to all of the birds in a 1:2:3 ratio (by volume, not weight) with scratch and either All-Stock or Sweet Feed from the livestock section.
I know, you're all wondering why, right?
Ultra Kibble is a supplement. It's 40% protein with spices, vitamins, minerals, and all sorts of goodies none of the other feeds have. All of the other feeds are made out of the grains you find in scratch. So when you add scratch, the birds like to eat it, but they get less of the nutrients they need, as scratch is only 8% protein.
By using Ultra-kibble, they get to eat food they like, with the concentrated nutrition they need, all in an interesting mix. If you wet it, it even SMELLS GOOD!
BEST PART: It's cheaper.
The Ultra-Kibble is $22 for a 15# bag- which is a lot more food than you think, as it's crunchy little spheres like cat food, not heavy pellets. BUT when you break it down to how much you spend per scoop (volume) and see that they eat about 75% as much because they're getting better nutrition and don't have to pound the food all day, it really makes a difference.
So...I feed premium food and spend less.
You have to ask
Tractor Supply to order it for you. They will do so very gladly. You buy mine off the shelf in the back room and I'll kill you dead. I'm feeding 200 birds and need it all!!!