Oregon Revised Statutes Public Health and Safety § 462.135

For the purpose of encouraging greyhound breeding within the state and enhancing the quality of Oregon bred greyhounds, all licensees of race meets for greyhounds shall conduct at least one race consisting exclusively of Oregon bred greyhounds at each live racing performance. If there is not a sufficient number of qualifying Oregon bred greyhounds to fill the Oregon bred greyhound race for a performance as required by this section, the licensee may enter other greyhounds in the race in addition to the available qualifying Oregon bred greyhounds. As used in this section, “performance” means a card or a single set of races.