Any food not intended for human consumption, if acceptable by the operator for storage, may be stored in the chill room, sharp freeze room or locker room of any locker plant only when such items of animal or vegetable matter have been inspected and approved by the representatives of the Bureau of Animal Industry of the United States Department of Agriculture or a representative of the department of agriculture of this state. Such food not intended for human consumption also shall bear a label or tag showing plainly and conspicuously in letters not less than three-eighths of an inch in height the words:

“NOT FOR HUMAN CONSUMPTION.”