Texas Agriculture Code - AGRIC § 146.001. Bill of Sale or Transfer Required

(a) If a person in this state sells or transfers a horse, mule, jack, jennet, ox, or head of cattle, the actual delivery of the animal must be accompanied by a written transfer to the purchaser from the vendor. The written transfer must give the marks and brands of the animal and, if more than one animal is transferred, must give the number transferred.

(b) On the trial of the right of property in an animal sold or transferred under Subsection (a) of this section, the possession of the animal without the written transfer is presumed to be illegal.

(c) A person may dispose of livestock on the range by sale and delivery of the marks and brands, but in order to acquire title the purchaser must have the bill of sale recorded in the county clerk's office. The county clerk shall record the transfer in records maintained for that purpose and shall note the transfer on the records of marks and brands in the name of the purchaser.