Oregon Revised Statutes Animals § 599.285

All pens used in livestock auction markets for holding dairy cattle and hogs and all alleyways between such pens shall be floored with concrete or some other impervious material. All such pens and alleys shall be sloped or otherwise constructed to permit adequate drainage. Such pens and alleyways and also fences, food racks and watering troughs shall be constructed so as to allow proper cleaning and sanitation. All such pens, alleyways, fences, food racks and watering troughs or other equipment shall be cleaned and disinfected after each sale or, in the case of a continuous sale, as often as may be prescribed by the State Department of Agriculture.