While I haven't filed from OK to TX, I have filed from TX to PA. Is your borrower an individual or an entity (partnership, corporation, etc)? Where is the borrower "located" (individual - where does he live, entity-what state are they registered or incorporated in)?
If your borrower is "located" in Texas, you will need to file a UCC-1 with the Texas Secretary of State, UCC Division. If your borrower is "located" in another state, you will need to file in that state in accordance with that state's rules. If the borrower is located in one state and the cattle are located in a different state, I usually file both places, just to be sure that someone doing a lien search would find my lien. When filing in Texas, be sure to use the borrower's correct full legal name.