(a) Except as otherwise provided by this section, a material is a commercial feed subject to this chapter if it is a simple, mixed, compounded, ground, unground, organic, or inorganic material used as a feed for an animal, including a vitamin, mineral, antibiotic, antioxidant, medicine, drug, chemical, or other material used as an ingredient or component of a mixture of materials used as a feed for an animal.
(b) Except as specifically provided by this chapter, a customer-formula feed is a commercial feed subject to this chapter.

(c) The following are not commercial feeds subject to this chapter:
(1) unground hay not containing toxins or chemical adulterants;
(2) whole grain or whole seed not containing toxins or chemical adulterants;
(3) unadulterated cotton plant by-products or any unadulterated hulls;
(4) a feed product produced and sold by a farmer;
(5) a feed mixed and used by a person who contracts with the owner of animals to care for and feed the animals;
(6) an individual mineral substance not mixed with another material;
(7) a material furnished by a purchaser for use in a customer-formula feed that was produced by the purchaser or acquired by the purchaser from a source other than the person whose services are engaged in the milling, mixing, or processing of a customer-formula feed; or
(8) a feed or feed ingredient handled by a broker.
(d) Regardless of whether a claim is made as to the prophylactic, therapeutic, or other purpose of the material, a mineral, vitamin, antibiotic, antioxidant, medicine, drug, or other material may be added to a commercial feed only if and in the manner authorized by the rules of the service. If a guarantee or claim is made for the material, the material is subject to inspection and analysis in accordance with the rules of the service.
(e) Whole seed and whole grain offered for retail sale for wildlife feed are commercial feeds subject to this chapter.