The Supreme Court couldn’t find it either.
"From the accepted doctrine that the United States is a government of delegated powers, it follows that those not expressly granted, or reasonably to be implied from such as are conferred, are reserved to the states, or to the people. To forestall any suggestion to the contrary, the Tenth Amendment was adopted. The same proposition, otherwise stated, is that powers not granted are prohibited. None to regulate agricultural production is given, and therefore legislation by Congress for that purpose is forbidden [emphasis added]." —United States v. Butler, 1936.
Citing this as precedent should forestall any further action against the owner. Or provide grounds for remedy if such action is pursued, including suit for denial of constitutional rights.
I’m sure it would end up in the Supreme Court, as falling under the interstate commerce clause, because more often than not, meat butchered in Texas does not stay in Texas.
That’s what Obammy would have claimed, anyway.
My fear is the Roberts would have sided with s/him/it.