Industrial animal agriculture is a modern form of intensive farming that refers to the industrialized production of livestock, including cattle, poultry (in "battery farms") and fish. Most of the meat, dairy and eggs available in supermarkets are produced by industrialized agriculture.Confined industrial animal agriculture of livestock and poultry are commonly referred to as factory farming and are criticised by opponents for the low level of animal welfare standards and associated pollution and health issues.The practice is widespread in developed nations. According to the Worldwatch Institute, 74 percent of the world's poultry, 43 percent of beef, and 68 percent of eggs are produced this way.