Iowa Admin. Code r. 21-42.3
42.3(4) The name of the pet food shall not be derived from one or more ingredients of a mixture of a pet food product unless all components or ingredients are included in the name except as specified by 42.3(1), 42.3(5), or 42.3(6); provided that the name of an ingredient or combination of ingredients may be used as a part of the product name if: