Today it is not uncommon for a single feedlot to hold 100,000 animals at a time. While corn is the king of cattle feed, many industrial food animals are fed just about anything that can add weight cheaply and quickly, regardless of how unappetizing or sadistic it may seem. Some commonly used cattle feed additives include: hydrolyzed poultry feathers, by-products of slaughtered animals, inter-species waste such as swine manure and poultry litter, antibiotic drugs, cement dust, newspaper, and plastic roughage replacements.