Beef cattle

Most beef cattle spend the last few months of their lives at feedlots, crowded by the thousands into dusty, manure-laden holding pens. The air is thick with harmful bacteria and particulate matter, and the animals are at a constant risk for respiratory disease. Feedlot cattle are routinely implanted with growth-promoting hormones, and they are fed unnaturally rich diets designed to fatten them quickly and profitably. Because cattle are biologically suited to eat a grass-based, high fiber diet, their concentrated feedlot rations contribute to metabolic disorders.