Okla. Admin. Code § 35:15-40-45
Exposed cattle and bison shall be identified by branding the letter "S" on the tail head not less than two (2) inches wide nor less than three (3) inches high and by tagging with an approved metal eartag bearing a serial number attached to either ear of each animal. In lieu of branding, the animals may be accompanied to an approved slaughter facility by a state or federal representative or be shipped in vehicles closed with official seals. Exposed swine and goats shall be identified by tagging with a serially number metal eartag attached to either ear. All such animals to be destroyed shall be transported to the place of destruction in vehicles closed with official seals or shall be accompanied to the place of destruction by a state or federal representative. The above conditions are required unless animals are destroyed and disposed under the direct supervision of a state or federal representative on the premises where the animals were exposed.
Okla. Admin. Code § 35:15-40-45