All dairy cattle over six months of age, except steers, spayed females and dairy cattle which by reason of age, disease or other conditions will be purchased for slaughter purposes, and all hogs entering the market zone of a livestock auction market shall be placed and retained, before and after sale, in clean, disinfected and segregated pens kept solely for that purpose. [1953 c.677 §8; 1957 c.390 §14; 1969 c.33 §1]
