I thought it had to come from a USDA inspected facility to sell individual cuts or packages of meat in texas also. If you go to a normal butcher and have a calf cut up it usually says NOT FOR SALE across the packages.
Im not saying I agree or disagree with the laws but the enforcement will come if some one gets sick or you sell some bad meat.
I live in a state that has high enforcement from the State Dept of Ag (due most recently to some rogue dairies selling "natural milk" that sparked an e.coli outbreak).
To sell less than say 1/8th of an animal I need to find a state locker that has a "like USDA" inspection.
The state that borders mine (roughly 15 miles away from my home) has a similar law on the books but does not enforce it and selling individual cuts seems to cause no problems for either the locker or producer.
I'm not against regulations for consumer safety. But I also know that the locker that I frequent that is not a "like USDA" participant is the cleanest and best managed locker I've ever encountered. The "like USDA" one I've used leaves me scratching my head in terms of "clean/sanitary".
In my opinion, the truth is that these laws exist for consumer safety but they are kept on the books by large meat packers.
And don't get me started that these regulations exist for meat but don't for say organic spinach fertilized with manure.
the :/tldr version -- check with your state's Dept of AG rules and regulations for meat sales.