Almost all U.S. meat comes from animals that are raised or fattened in ‘factory farms’ known as Concentrated Animal Feeding Operations (CAFOs). These industrial operations have grown exponentially and pack thousands and sometimes tens of thousands of animals together. The largest 2 percent of facilities now hold more than 40 percent of all U.S. livestock. The animals confined in these operations produce more than 500 million tons of manure a year, and cause significant water and air pollution, while emitting nitrous dioxide and methane, two potent greenhouse gases.
Americans eat a lot of meat and poultry that are raised on CAFOs. Wikipedia shares: Most poultry were raised in CAFOs starting in the 1950s, and most cattle and pigs by the 1970s and 1980s. By the mid-2000s CAFOs dominated livestock and poultry production in the United States, and the scope of their market share is steadily increasing.
Factory farm animals live in crowded, dirty conditions most often infested with flies and rodents. The water the animals drink is often contaminated with any number of pollutants from the housing conditions. The following is for your information and consideration: