A person may not sell, transport, offer for sale or transportation, or receive for transportation in intrastate commerce carcasses of horses, mules, or other equines or meat food products derived from them, unless they are plainly and conspicuously marked, labeled, or otherwise identified to show the kinds of animals from which they were derived. The commissioner by rule may require that the preparation of equine carcasses and equine meat food products take place in establishments separate from those in which cattle, sheep, swine, or goats are slaughtered or in which their carcasses or meat food products are prepared.