Crude protein (minimum percentage)
Crude fat (minimum percentage)
Crude fiber (maximum percentage)
Moisture (maximum percentage)
Additional guarantees shall follow moisture.
'To the extent that the product's ingredients provide nutrients in amounts which substantially deviate from those nutrient requirements estimated by such a recognized authority on animal nutrition, or in the event that no estimation has been made by a recognized authority on animal nutrition of the requirements of animals for one or more stages of said animals' lives, the product's represented capabilities in this regard must have been demonstrated by adequate testing.
Iowa Admin. Code r. 21-42.2