The labeling of any product defined in this act or in the rules and regulations adopted thereunder, except raw milk for processing, shall include the designation of the product, the name and address of the processor or distributor, and a declaration of the net contents and such other declarations as established by the secretary by rule or regulation. When the name and address of the distributor appear in lieu of that of the processor, such words as “manufactured for,” “distributed by,” or “packed for,” shall also appear on the package as well as a code approved by the Secretary of Agriculture indicating the actual processor's name and address. Brand names may be approved by the Secretary of Agriculture provided that they do not detract from the proper designation of the product.