What about flock raiser and oyster shells?
flock raiser and all flock are basically the same thing, low calcium and higher crude protein.
Do you think that grower feed is better than an all flock feed to feed to chickens ducks and guinea? Hens roosters and drakes?
I would say so without looking at the guaranteed analysis tag. Theoretically 'all flock' should have a vitamin balance that can nurture waterfowl.
I've seen grower feed that is basically the same as all flock/flock raiser.
As I said before, it doesn't matter what the mill calls their feed. What matters is the protein (amino acid balance) vitamins and minerals. I've seen great disparities in vitamin content of feeds from different companies that all name them 'all flock'. That's why the name doesn't matter.
For instance, Purina flock raiser has almost twice the level of fat-soluble vitamins as that in one of the lines of Nutrena feed - also called flock raiser. Not to mention disparities in minerals and water-soluble vitamins.
If you have a choice between two or more feeds, go online or call the company and ask what the specific nutrient levels are in the feeds. They should be willing to provide that info.
Not all nutrients are required to be listed on analysis tags. Regs differ for each species of animal and what is required to be listed.
Vitamins A and D aren't required to be listed but, in my experience, those that do list them tend to have higher levels of those nutrients than competitors.
Most nutrients; amino acids, fat, fiber and minerals are listed as a percentage of total weight. vitamins are listed as international units per pound (IU/LB).