Oregon Revised Statutes Animals § 596.460

(1) A person owning, possessing or controlling any livestock affected by any disease may not fail to keep the livestock within an enclosure, or herd them in some place where they are secure from contact with other livestock not so affected or permit the affected livestock to range where they will be likely to come in contact with other livestock not so affected.

(2) A person may not maintain or control female cattle of a beef breed for breeding purposes unless the animals have been vaccinated against brucellosis as evidenced by an official vaccination tattoo in the right ear of each animal.

(3) A person may not maintain or control female cattle of a dairy breed for breeding or dairy purposes unless the animals have been vaccinated against brucellosis as evidenced by an official vaccination tattoo in the right ear of each animal.