Livestock is commonly defined as domesticated animals raised in an agricultural setting to produce labor and commodities such as meat, eggs, milk, fur, leather, and wool. The term is sometimes used to refer solely to those that are bred for consumption, while other times it refers only to farmed ruminants, such as cattle and goats.[1] Horses are considered livestock in the United States.[2] The USDA classifies pork, veal, beef, and lamb as livestock and all livestock as red meat. Poultry and fish are not included in the category.[3]
The breeding, maintenance, and slaughter of livestock, known as animal husbandry, is a component of modern agriculture that has been practiced in many cultures since humanity's transition to farming from hunter-gatherer lifestyles. Animal husbandry practices have varied widely across cultures and time periods, and continues to play a major economic and cultural role in numerous communities.
Livestock farming practices have largely shifted to intensive animal farming, sometimes referred to as "factory farming"; over 99% of livestock in the US are now raised in this way.
Intensive animal farming increases the yield of the various commercial outputs, but has also led to negative impacts on animal welfare, the environment, and public health.[5] In particular, livestock, especially beef, dairy and sheep stocks, have out-sized influence on greenhouse gas emissions from agriculture. Due to these negative impacts, but also for reasons of farming efficiency (see Food vs. feed), one projection argues there will be a large decline of livestock at least some animals (e.g. cattle) in certain countries by 2030,[6][7] and the book The End of Animal Farming argues that all animal husbandry will end by 2100.[8]
Animal-rearing originated during the cultural transition to settled farming communities from hunter-gatherer lifestyles. Animals are domesticated when their breeding and living conditions are controlled by humans. Over time, the collective behaviour, lifecycle and physiology of livestock have changed radically. Many modern farm animals are unsuited to life in the wild.
The dog was domesticated early; dogs appear in Europe and the Far East from about 15,000 years ago.[13] Goats and sheep were domesticated in multiple events sometime between 11,000 and 5,000 years ago in Southwest Asia.[14] Pigs were domesticated by 8,500 BC in the Near East[15] and 6,000 BC in China.[16] Domestication of the horse dates to around 4000 BC.[17] Cattle have been domesticated since approximately 10,500 years ago.[18] Chickens and other poultry may have been domesticated around 7000 BC.[
The value of global livestock production in 2013 has been estimated at about 883 billion dollars, (constant 2005-2006 dollars).[59]Livestock provide a variety of food and nonfood products; the latter include leather, wool, pharmaceuticals, bone products, industrial protein, and fats. For many abattoirs, very little animal biomass may be wasted at slaughter. Even intestinal contents removed at slaughter may be recovered for use as fertilizer. Livestock manure helps maintain the fertility of grazing lands. Manure is commonly collected from barns and feeding areas to fertilize cropland. In some places, animal manure is used as fuel, either directly (as in some developing countries), or indirectly (as a source of methane for heating or for generating electricity). In regions where machine power is limited, some classes of livestock are used as draft stock, not only for tillage and other on-farm use, but also for transport of people and goods. In 1997, livestock provided energy for between an estimated 25 and 64% of cultivation energy in the world's irrigated systems, and that 300 million draft animals were used globally in small-scale agriculture.[60]
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