(b) Commercial feeds containing 6 ½ percent or more mineral elements shall include in the guaranteed analysis the minimum and maximum percentages of calcium (Ca), if any, the minimum percentage of phosphorus (P), if any, and if salt (NaCl) is added, the minimum and maximum percentages of salt. In such case, the minerals, except salt (NaCl), shall be guaranteed in terms of percentage of the element. When calcium and/or salt guarantees are given in the guaranteed analysis, such shall conform to the following:

1. (1) When the minimum of calcium or salt is five percent or less, the maximum of the same shall not exceed the minimum by more than one percentage point.
2. (2) When the minimum of calcium or salt is above five percent, the maximum of the same shall not exceed the minimum by more than 20 percent and in no case shall the maximum exceed the minimum by more than five percentage points.

(c) Guarantees for minimum vitamin content of commercial feeds and feed supplements, when made, shall be stated on the label in milligrams per pound of feed, except that:

1. (1) Vitamin A, other than precursors of vitamin A, shall be stated in international or USP units per pound.
2. (2) Vitamin D, in products offered for poultry feeding, shall be stated in international chick units per pound.
3. (3) Vitamin D for other uses shall be stated in international or USP units per pound.
4. (4) Vitamin E shall be stated in international or USP units per pound.
5. (5) Guarantees for vitamin content on the label of any commercial feed shall state the guarantee as true vitamins, not compounds, with the exception of the compounds, pyridoxine hydrochloride, choline chloride, thiamin, and d-pantothenic acid.
6. (6) Oils and premixes containing vitamin A or vitamin D or both may be labeled to show vitamin content in terms of units per gram.

(d) Guarantees for drugs shall be stated in terms of percent by weight, except that:

1. (1) Antibiotics present at less than 2,000 grams per ton (total) of commercial feed shall be stated in grams per ton of such feed;
2. (2) Antibiotics present at 2,000 or more grams per ton (total) of commercial feed shall be stated in grams per pound of such feed;
3. (3) Labels for commercial feeds containing growth promotion and/or feed efficiency levels of antibiotics, which are to be fed continuously as the sole ration, are not required to make quantitative guarantees, except as specifically provided in the Federal food additive regulations for certain antibiotics, wherein quantitative guarantees are required regardless of the level or purpose of the antibiotic.
4. (4) The term “milligrams per pound” may be used for drugs or antibiotics in those cases where a dosage is given in “milligrams” in the feeding directions.

(e) Commercial feeds containing any added non-protein nitrogen shall be labeled as follows:

1. (1) Complete feeds, supplements, and concentrates containing added non-protein nitrogen and containing more than five percent protein from natural sources shall be guaranteed as follows: Crude protein, minimum, ____% (This includes not more than ____% equivalent protein from non-protein nitrogen.)
2. (2) Mixed feed concentrates and supplements containing less than five percent protein from natural sources may be guaranteed as follows: Equivalent crude protein from non-protein nitrogen, minimum, ____%
3. (3) Ingredient sources of non-protein nitrogen such as urea, di-ammonium phosphate, ammonium polyphosphate solution, ammoniated rice hulls, or other basic non-protein nitrogen ingredient sources officially defined by AAFCO, except where the commissioner prescribes otherwise, shall be guaranteed as follows: Nitrogen, minimum, ____% Equivalent crude protein from non-protein nitrogen, minimum, ____%.