Tex. Health & Safety Code § 433.033
A person may not sell, transport, offer for sale or transportation, or receive for transportation, in intrastate commerce, a carcass, part of a carcass, meat, or a meat food product of a horse, mule, or other equine unless the article is plainly and conspicuously marked or labeled or otherwise identified, as required by department rule, to show the kind of animal from which the article was derived. The department may require an establishment at which inspection is maintained under this chapter to prepare those articles in an establishment separate from one in which livestock other than equines is slaughtered or carcasses, parts of carcasses, meat, or meat food products of livestock other than equines are prepared.
Tex. Health and Safety Code § 433.033