What the label carries
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The requirement
Ingredients required to be declared "shall be listed by common or usual name in descending order of predominance by weight".
By weight, which matters for a dry product
A supplement blended from ingredients of very different bulk densities can look one way by volume and rank differently by weight. The order on the label follows the scale, not the scoop.
Specific rather than generic
The regulation wants names that identify the ingredient. Vague or umbrella terms are the exception rather than the default, and the exceptions are enumerated.
The collective name allowance
21 CFR 501.110 permits livestock and poultry feeds to use certain collective names. For a formula containing several related ingredients that is a genuine simplification, and it is worth checking whether yours qualifies before writing out a long list.
It is a statement about the formula
Which means it moves when the formula moves. A substitution that changes the predominance order is a label change even if every ingredient is still present.
The state guaranteed analysis sits beside it
Protein, fat, fibre and whatever else that state requires, guaranteed as minimums or maximums. It is a different statement from the ingredient list, it is verifiable by assay, and a guarantee you cannot meet in every batch is a guarantee you should not print.
Panel area, as everywhere
A feed label carries an ingredient declaration, a guaranteed analysis, a net quantity, a name and address, feeding directions and often a cautionary statement. On a small container that is most of the surface.
Keep the declaration and the batch sheet in one place
The label states the order; the batch sheet states the weights. Holding them apart is how a reformulation changes one and not the other, and the disagreement is invisible until somebody checks.
Common or usual means what a buyer would recognise
Not the trade name your supplier uses and not a chemical name nobody reads. The test in the regulation is that the name identifies the ingredient to the person reading the label.