California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 14365

(a) It is unlawful to sell or dispose of a dairy cull cow without first affixing to the animal a producer identification number issued by the director.

(b) For purposes of this chapter, “cull cow” means a female bovine animal 21 days of age or more, which is sold or disposed of for the purpose of slaughter.

(c) Cull cows that are identified as provided in Division 10 (commencing with Section 20001) are exempt from this section.