Aberdeen Livestock Sales Company is one of the leaders in the livestock marketing industry. The company holds regular auctions every Monday and publishes online market report on every auction. The auction is based on the weights of livestock like cows and bulls. The firm sells only those livestock that are certified by the United States Food and Drug Administration that certifies that none of the cattle or other ruminant animals has been fed any feed containing prohibited proteins derived from mammalian/ruminant tissues and that none of the livestock being sold have illegal levels of drug residues. The firm is associated with South Dakota Auctioneers Association and has headquarters in Aberdeen, S.D.