Livestock is the term used to refer (singularly or plurally) to a
 domesticated intentionally reared in an  agricultural setting to make produce such as 
  animal food or fibre, or for its labour. The term generally does  not include 
poultry or farmed 
fish. Livestock may be raised for subsistence or for profit. Raising animals (animal husbandry) is  an important component of modern agriculture. It has been practiced in many  societies, since the transition to farming from hunter-gather lifestyles.

Origins of livestock  
The maze of  livestock pens and walkways at Chicago's stockyards, ca. 1941.
  Animal-rearing has its origins in the  transition of societies to settled farming communities rather than hunter-gatherer  lifestyles. Animals are ‘domesticate
d’ when their breeding and living  conditions are controlled by humans. Over time, the collective behaviour, life cycle,  and physiology of livestock have  changed radically. Many modern farm animals are unsuited to life in the wild. Goats and sheep were domesticated around 8000 BCE in Asia. Swine or pigs were  domesticated by 7000  BCE in the Middle East  andChina. The  earliest evidence of horse domestication  dates to around 
 
  Types of livestock
 
 The term "livestock" is nebulous and may be defined narrowly or broadly.
 On a broader view, livestock refers to any breed or population of animal kept  by humans for a useful, commercial purpose. This can mean domestic animals, semi-domestic  animals, or captive  wild animals. Semi-domesticated refers to animals which are only lightly  domesticated or of disputed status. These populations may also be in the process  of domestication
 
 In practical discussions, some people may use the term livestock to refer  just to domestic animals or even just to red meat animals

   
Purpose of animal rearing
  
   A 
Brown Swiss cow in the 
Swiss Alps    ‘Livestock’ are defined, in part, by their end purpose as the production of  food or fiber, or labour.
 The economic value of livestock includes:
 
  - Meat  
 - the production of a useful form of dietary protein and energy.   
 - Dairy products   
 - Mammalian livestock can be used as a source of milk, which can in turn easily be processed into other  dairy products such as yogurt, cheese,  butter, ice cream, kefir, and kumis.  Using livestock for this purpose can often yield several times the food energy of slaughtering  the animal outright.  
 - Fiber   
 - Livestock produce a range of fiber/textiles. For example, sheep and goats produce wool and mohair; cows, deer,  and sheep can make  leather; and bones, hooves and horns of livestock can be used.  
 - Fertilizer   
 - Manure can be spread on fields to  increase crop yields. This is an important reason why historically, plant and animal domestication have been intimately linked. Manure  is also used to make plaster for walls and floors and can be used as a fuel for  fires. The  blood and

  bone of animals are also used as fertilizer.   - Labour   
 - Animals such as horses, donkey, and yaks can  be used for mechanical energy. Prior to steam power livestock were the only available  source of non-human labour. They are still used for this purpose in many places  of the world, including ploughing  fields, transporting goods, and military functions.  
 - Land management
 
 -   
 - The grazing of livestock is sometimes used as a way to control weeds and  undergrowth. For example, in areas prone to wild fires, goats and sheep are set  to graze on dry scrub which removes combustible material and reduces the risk of  fires. 
 
 During the history of animal husbandry many secondary products have  arisen in an attempt to increase carcass utilization and reduce waste. For  example, animal offal and non-edible parts  may be transformed into products such as pet food and fertilizer. In the past  such waste products were sometimes also fed to livestock as well. However,  intra-species recycling poses a disease risk, threatening animal and even human  health (see  (BSE), bovine spongiform  encephalopathyscrapie and  prion). Due primarily to BSE (mad cow  disease), feeding animal scraps to animals has been banned in many countries, at  least in regards to ruminants.

 
Farming practices
  
   Goat family  with 1-week-old young
   -  
Main article: animal  husbandry
 
 Farming practices vary dramatically world-wide and between types of  animals.
 Livestock are generally kept in an enclosure, are fed by human-provided food  and are intentionally bred, but some livestock are not enclosed, or are fed by  access to natural foods, or are allowed to breed freely, or any combination  thereof.
 Livestock raising historically was part of a nomadic or pastoral form of material culture. The  herding of camels and reindeer in some parts of the world remain unassociated  with sedentary  agriculture. The transhumance form of herding in the Sierra  Nevada Mountains of California still continues as cattle, sheep or goats  are moved from winter  pasture in lower lying valleys to spring  pasture and summer  pasture in the foothills and alpine regions as the seasons progress. Cattle  were raised on the open range in the Western United States and Canada,  as well as on the Pampas of Argentina and other prairie and steppe regions of the world.
 The enclosure of livestock in pastures and barns is a relatively new development in the history of  agriculture. When cattle are enclosed, the type of ‘enclosure’ may vary from  a small crate or to a large fenced pasture. The type of feed may vary from natural growing  grass, to highly sophisticated processed  feed. Animals are usually intentionally bred through artificial insemination  or through supervised mating.
 Indoor production systems are generally used only for pigs and poultry, as well as for veal cattle.  Indoor animals are generally farmed intensively, as large space requirements  would make indoor farming unprofitable and impossible. However, indoor farming  systems are controversial due to: the waste they produce, odour problems, the  potential for groundwater  contamination and animal welfare concerns. (For further discussion on  intensively farmed livestock, see factory farming, and intensive pig  farming).
 Other livestock are farmed outside, although the size of enclosure and level  of supervision may vary. In large open ranges animals may be only occasionally  collected in "round-ups" or "musters". Herding dogs such as sheep dogs and  cattle dogs, may  be used for mustering as are cowboys,  stockmen and jackaroos on horseback or in helicopters. Since the advent of barbed wire (in the 1870s) and  electric fence  technology, fencing pastures has become much more feasible and pasture  management simplified. Rotation of pasturage is a modern technique for improving  nutrition and health while avoiding environmental damage to the land. In some  cases very large numbers of animals may be kept in indoor or outdoor feeding  operations (on feedlots), where the  animals' feed is processed, offsite or onsite, and stored onsite then fed to the  animals.
 Livestock - especially cattle - may be branded to indicate ownership, but in modern  farming identification is more likely to be indicated by means of ear tags than branding. This is not  only more humane, but also has other advantages such as reducing the likelihood  of infection and damage to the livestock  Sheep are also frequently marked by means of ear tags. As fears of mad cow  disease and other epidemic  illnesses mount, the use of microchip  identification to monitor and trace animals in the food  production system is increasingly common, and sometimes required by  governmental regulations.
 Modern farming  techniques seek to minimize human involvement, increase yield, and improve  animal health. Economics, quality  and consumer safety all play a role in how animals are raised. Drug use and  feed supplements (or even feed type) may be regulated, or prohibited, to ensure  yield is not increased at the expense of consumer health, safety or animal  welfare. Practices vary around the world, for example growth hormone use is permitted in the United States but not in  the European Union or  in countries selling meat/produce in the EU such as Australia and New Zealand.
 
 Disease
 Livestock diseases compromise animal welfare, reduce productivity, and in  rare cases can infect humans.
 Animal diseases may be tolerated; reduced through animal husbandry; or  reduced through antibiotics and vaccines. In developing countries animal  diseases are tolerated in animal husbandry, resulting in considerably reduced  productivity, especially given the low health-status of many developing country  herds. Gains in productivity through disease management is often a first step  taken in implementing an agriculture policy.
 Disease management can be achieved through changes in animal husbandry. These  measures may aim to control spread by: controlling animal mixing, controlling  entry to farm lots and the use of protective clothing, and quarantining sick  animals. Disease management may be controlled by the use of vaccines and  antibiotics. Antibiotics may also be used as a growth-promoter. The issue of antibiotic  resistance has limited the practices of preventative dosing such as  antibiotic-laced feed.
 Countries will often require the use of veterinary certificates are often required before  transporting, selling or showing animals. Disease-free areas are often  rigorously enforced, and may be notified to the OIE.
 
  Livestock transportation and marketing
Main article: Livestock transportation
 
  
   Grass-fed  cattle, saleyards, 
Walcha,  NSW
   Since many livestock are herd animals, they were historically driven to market "on the hoof" to a town or other  central location. During the period after the American Civil War, the abundance of Longhorn cattle in Texas and the demand for beef in Northern markets led to  the popularity of the Old West cattle drive. The method is  still used in some parts of the world. Trail driving bulls is not common due to  their strength and aggressive nature, although the Geier Hitch technique will permit some control of a  bull via lead rope. Truck transport is now common in developed  countries. Local and regional livestock auctions and commodity markets facilitate trade in  livestock. In other areas livestock may be bought and sold in a bazaar, such as may be found in many parts of Central Asia, or a flea market type setting such  as the  in First Monday Trade DaysCanton, Texas.
 
  Stock shows and fairs
 Stock  shows and fairs are events where people  bring their best livestock to compete with one another. Organizations like 4-H and FFA encourage young people to raise  livestock for show purposes. Special feeds are purchased and hours may be spent  prior to the show grooming the animal to look its best. In cattle, sheep, and  swine shows, the winning animals are frequently auctioned off to the highest  bidder and the funds placed into a scholarship fund for its owner. The movie  Grand Champion,  released in 2004, is the story of a young Texas boy's experience raising a prize  steer.
  
   Poultry  Building, Western Fair 1923.
   
  Animal welfare and surmised rights
 The issue of rearing livestock for human benefit raises the issue of the  relationship between humans and animals, in terms of the status of animals and  obligations of people.
 Animal welfare is  the viewpoint that animals under human care should be treated in such a way that  they do not suffer unnecessarily. What is ‘unnecessary’ suffering may vary.  Generally though, the animal welfare perspective is based on an interpretation  of scientific research on farming practices.
 By contrast, Animal  rights is the viewpoint that using animals for human benefit is, by its  nature, generally exploitation regardless of the farming practice used. It is a  position based on anthropomorphism, in which individuals seek to place  themselves in the position of an animal. Animal rights activists would generally  be vegan or vegetarian, whereas it is consistent with the animal welfare  perspective to eat meat depending on production processes.
 Animal welfare  groups generally seek to generate public discussion on livestock rearing  practices and secure greater regulation and scrutiny of livestock industry  practices. Animal rights  groups usually seek the abolition of livestock farming, although some groups may  recognise the necessity of achieving more stringent regulation first. Animal  welfare groups, such as the RSPCA, are often – in first world countries - given  a voice at governmental level in the development of policy. Animal rights groups  find it harder to find methods of input, and may go further and advocate civil  disobedience or violence.
 Animal husbandry practices that have led to legislation in some countries and  that may be the subject of current campaigns
 - Confinement of livestock in small and unnatural spaces: For economic or  health reasons animals may be kept in the minimum size of cage or pen with  little or no space to exercise or engage in normal actions or grooming. Close  confinement is most common with chickens, pigs, and calves raised for veal.  
 - Unnatural living environments: Even when allowed to move, animals may be  denied a natural environment. For example ducks may be kept in free-range barns  but have no access to water in which to swim. Cattle may be kept in barns with  no chance to graze. Dogs or cats may be kept indoors with no chance to hunt.  
 - Overuse of pharmaceuticals and hormones: Intensive raising of livestock may  lead to a health problems and the necessity to use antibiotics to prevent  disease. In some cases antibiotics and hormones are also fed to livestock to  produce rapid weight gain.  
 - Overwork and exhaustion of animals: Where livestock are used as a source of  power they may be pushed beyond their limits to the point of exhaustion. The  public visibility of this abuse meant it was one of the first areas to receive  legislation in the nineteenth century in European countries but it still goes on  in parts of Asia.  
 - Modification to the bodies of living animals: Broiler hens may be de-beaked,  pigs have deciduous teeth pulled, cattle de-horned and branded, dairy cows and  sheep have tails cropped, merino sheep mulesed, many types of male animals  castrated.  
 - Long distance transportation of livestock: Animals may be transported long  distances to market and slaughter. Overcrowded conditions, heat from  tropical-area shipping and lack of food, water and rest breaks have been subject  to legislation and protest. (See Live Export)  
 - Slaughter of livestock: Slaughter was  an early target for legislation. Campaigns continue to target Halal and Kosher religious ritual slaughter. 
 
 
  Environmental impact
 According to the 390 page 2006 United Nations report "Livestock's Long Shadow", the  livestock sector (primarily cows, chickens, and pigs) emerges as one of the top  two or three most significant contributors to our most serious environmental  problems, at every scale from local to global. The report recommends an  immediate halving of the world's livestock numbers, in order to mitigate the  worst effects of climate  change.
 Livestock is responsible for 18% of the world’s greenhouse gas emissions as measured in  CO2 equivalents. By comparison, the world's entire transportation  sector emits 13.5% of the CO2.
 In the US, which produces about 23% of global greenhouse gases, agriculture accounts for 7% of total greenhouse gas emissions  (in CO2 equivalents), while transportation produces more than 25%. By  comparison, the energy sector, which includes transportation, accounted for  more than 85% of US greenhouse gas emissions in 2004.
 Agriculture produces 65% percent of human-related nitrous oxide (which has  296 times the global warming potential of CO2) and 37% of all  human-induced methane (which is 23  times as warming as CO2). It also generates 64% of the ammonia, which contributes to acid rain and acidification of ecosystems .
 The findings of the United Nations report suggest that addressing  the issue of livestock should be a major policy focus when dealing with problems  of land  degradation, climate  change and air  pollution, water  shortage and water  pollution, and loss of biodiversity.
 A research team at Obihiro  University of Agriculture and Veterinary Medicine in Hokkaido found that supplementing the  animals' diet with cysteine, a type of amino acid, and nitrate can reduce the  methane gas produced, without jeopardising the cattle's productivity or the  quality of their meat and miilk.