“Meat food product” means any product which is capable of use as human food that is made wholly or in part from any meat or other portion of the carcass of any cattle, sheep, swine, or goat. The director may exempt from this definition any product which contains meat or any other portion of such a carcass only in a relatively small proportion which is found by the director not to be a product of the meat food industry for the purposes of this chapter, under such conditions as he may prescribe to assure that the meat or other portion of such carcass which is contained in such product is not adulterated and that such product is not represented as a meat food product. The term meat food product, as applied to any food product of any equine, has the same meaning as is provided in this paragraph with respect to meat food products of cattle, sheep, swine, and goats.