No person may sell, transport, offer for sale or transportation, or receive for transportation in intrastate commerce, whole or parts of carcasses of horses, mules, or other equines or meat or meat food products derived from them, unless they are plainly and conspicuously marked, labeled, or otherwise identified as required by rules prescribed by the commissioner to show the kinds of animals from which they were derived. When required by the commissioner with respect to establishments where inspection is done under sections 31A.01 to 31A.16, equines and their carcasses, parts, meat, and meat food products must be prepared in establishments separate from those in which cattle, sheep, swine, or goats are slaughtered or their carcasses, parts, meat, or meat food products are prepared.