Animal food. Any article intended for use as food for dogs, cats, or other animals derived wholly, or in part, from the carcass or parts or products of the carcass of any livestock, except that the term animal food as used herein does not include:
(1) Processed dry animal food or
(2) Livestock or poultry feeds manufactured from processed livestock byproducts (such as meatmeal tankage, meat and bonemeal, bloodmeal, and feed grade animal fat).
9 CFR § 301.2
As used in this subchapter, unless otherwise required by the context, the following terms shall be construed, respectively, to mean: