(a) A commercial feed, other than a customer-formula feed, shall be accompanied by a label bearing the following information:

(1) The net weight, which may be stated in metric units in addition to the required avoirdupois units;

(2) The product name and the brand name, if any, under which the commercial feed is distributed;

(3) The guaranteed analysis stated in such terms as the Commissioner, by regulation, determines is required to advise the user of the composition of the feed or to support claims made in the labeling. In all cases the substances or elements must be determinable by laboratory methods, such as the methods published by the Association of Official Analytical Chemists;

(4) The common or usual name of each ingredient used in the manufacture of the commercial feed, provided that the Commissioner, by regulation, may permit the use of a collective term for a group of ingredients which performs a similar function; or he may exempt such commercial feeds, or any group thereof, from this requirement of an ingredient statement if he finds that such statement is not required in the interest of consumers;

(5) The name and the principal mailing address of the manufacturer or the person responsible for distributing the commercial feed;

(6) Adequate directions for use for all commercial feeds containing drugs and for such other feeds as the Commissioner may require by regulation as necessary for their safe and effective use; and

(7) Such precautionary statements as the Commissioner, by regulation, determines are necessary for the safe and effective use of the commercial feed.

(b) A customer-formula feed shall be accompanied by a label, invoice, delivery slip, or other shipping document bearing the following information:

(1) The name and address of the manufacturer;

(2) The name and address of the purchaser;

(3) The date of delivery;

(4) The product name and brand name, if any, and the net weight of each commercial feed used in the mixture;

(5) The net weight of every other ingredient used;

(6) Adequate directions for use for all customer-formula feeds containing drugs and for such other feeds as the Commissioner may require, by regulation, as necessary for their safe and effective use;

(7) Such precautionary statements as the Commissioner, by regulation, determines are necessary for the safe and effective use of the customer-formula feed; and

(8) If a drug-containing product is used:

(A) The purpose of the medication (claim statement); and

(B) The established name of each active drug ingredient and the level of each drug used in the final mixture expressed in accordance with regulations.