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A slaughterhouse, abattoir i// or meatworks is a facility where animals are killed for consumption as food. Slaughterhouses that process meat not intended for human consumption are sometimes referred to as knacker's yards or knackeries, used for animals that aren't fit for consumption or can no longer work on a farm such as horses that can no longer work .
Slaughtering animals on a large scale poses significant logistical problems and public health requirements and public aversion in many cultures influences the location of slaughterhouses.
Animal welfare and animal rights groups frequently raise concerns about the methods of transport, preparation, herding, and killing within some slaughterhouses under the example of animal rights activists such as Howard Lyman and Ric O’Barry. 
Typically 45–50% of the animal can be turned into edible products (meat). About 5-15% is waste, and the remaining 40–45% of the animal is turned into byproducts such as leather, soaps, candles (tallow), and animal glue.
Until modern times, the slaughter of animals generally took place in a haphazard and unregulated manner in diverse places. Early maps of London show numerous stockyards in the periphery of the city, where slaughter occurred in the open air. A term for such open-air slaughterhouses was shambles, and there are streets named "The Shambles" in some English towns (e.g. Worcester, York) which got their name from having been the site on which butchers killed and prepared animals for consumption.
The slaughterhouse emerged as a coherent institution in the nineteenth century. A combination of health and social concerns, exacerbated by the rapid urbanisation experienced during the Industrial Revolution, led social reformers to call for the isolation, sequester and regulation of animal slaughter. As well as the concerns raised regarding hygiene and disease, there were also criticisms of the practice on the grounds that the effect that killing had, both on the butchers and the observers, "educate[d] the men in the practice of violence and cruelty, so that they seem to have no restraint on the use of it." An additional motivation for eliminating private slaughter was to impose a careful system of regulation for the "morally dangerous" task of putting animals to death.
As a result of this tension, meat markets within the city were closed and abattoirs built outside city limits. An early framework for the establishment of public slaughterhouses was put in place in Paris in 1810, under the reign of the Emperor Napoleon. Five areas were set aside on the outskirts of the city and the feudal privileges of the guilds were curtailed.
As the meat requirements of the growing number of residents in London steadily expanded, the meat markets within the city attracted increasing levels of opprobrium. Meat had been traded at Smithfield Market as early as the 10th century. By 1726, it was regarded as "without question, the greatest in the world", by Daniel Defoe. By the middle of the 19th century, in the course of a single year 220,000 head of cattle and 1,500,000 sheep would be "violently forced into an area of five acres, in the very heart of London, through its narrowest and most crowded thoroughfares".
By the early 19th century, pamphlets were being circulated arguing in favour of the removal of the livestock market and its relocation outside of the city due to the extremely poor hygienic conditions as well as the brutal treatment of the cattle. In 1843, the Farmer's Magazine published a petition signed by bankers, salesmen, aldermen, butchers and local residents against the expansion of the livestock market.
An Act of Parliament was finally passed in 1852. Under its provisions, a new cattle-market was constructed in Copenhagen Fields, Islington. The new Metropolitan Cattle Market was also opened in 1855, and West Smithfield was left as waste ground for about one decade, until the construction of the new market began in the 1860s under the authority of the 1860 Metropolitan Meat and Poultry Market Act. The market was designed by architect Sir Horace Jones and was completed in 1868.
A cut and cover railway tunnel was constructed beneath the market to create a triangular junction with the railway between Blackfriars and Kings Cross. This allowed animals to be transported into the slaughterhouse by train and the subsequent transfer of animal carcases to the Cold Store building, or direct to the meat market via lifts.
At the same time, the first large and centralized slaughterhouse in Paris was constructed in 1867 under the orders of Napoleon III at the Parc de la Villette and heavily influenced the subsequent development of the institution throughout Europe.
These slaughterhouses were regulated by law to ensure good standards of hygiene, the prevention of the spread of disease and the minimization of needless animal cruelty. The slaughterhouse had to be equipped with a specialized water supply system to effectively clean the operating area of blood and offal. Veterinary scientists, notably George Fleming and John Gamgee, campaigned for stringent levels of inspection to ensure that epizootics such as rinderpest (a devastating outbreak of the disease covered all of Britain in 1865) would not be able to spread. By 1874, three meat inspectors were appointed for the London area, and the Public Health Act 1875 required local authorities to provide central slaughterhouses (they were only given powers to close insanitary slaughterhouses in 1890).
Attempts were also made at reforming the practice of slaughter itself, as the methods used came under increasing criticism for causing undue pain to the animals. The eminent physician, Benjamin Ward Richardson, spent many years in developing more humane methods of slaughter. He brought into use no less than fourteen possible anesthetics for use in the slaughterhouse and even experimented with the use of electric current at the Royal Polytechnic Institution. As early as 1853, he designed a lethal chamber that would gas animals to death relatively painlessly, and he founded the Model Abattoir Society in 1882 to investigate and campaign for humane methods of slaughter.
The invention of refrigeration and the expansion of transportation networks by sea and rail allowed for the safe exportation of meat around the world. Additionally, Meat-packing millionaire Philip Danforth Armour’s invention of the 'disassembly line' greatly increased the productivity and profit margin of industrial meatpacking businesses: "according to some, animal slaughtering became the first mass-production industry in the United States." This expansion has been accompanied by increased concern about the physical and mental conditions of the workers along with controversy over the ethical and environmental implications of slaughtering animals for meat.
In the latter part of the 20th century, the layout and design of most U.S. slaughterhouses was influenced by the work of Dr. Temple Grandin. She suggested that reducing the stress of animals being led to slaughter may help slaughterhouse operators improve efficiency and profit. In particular she applied an understanding of animal psychology to design pens and corrals which funnel a herd of animals arriving at a slaughterhouse into a single file ready for slaughter. Her corrals employ long sweeping curves so that each animal is prevented from seeing what lies ahead and just concentrates on the hind quarters of the animal in front of it. This design – along with the design elements of solid sides, solid crowd gate, and reduced noise at the end point – work together to encourage animals forward in the chute and to not reverse direction.
As of 2011, Grandin claimed to have designed over 54% of the slaughterhouses in the United States as well as many others around the world.
By 2010 a mobile facility the Modular Harvest System had received USDA approval. It can be moved from ranch to ranch. It consists of three trailers, one for slaughtering, one for consumable body parts and one for other body parts. Preparation of individual cuts is done at a butchery or other meat preparation facility.
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The standards and regulations governing slaughterhouses vary considerably around the world. In many countries the slaughter of animals is regulated by custom and tradition rather than by law. In the non-Western world, including the Arab world, the Indian sub-continent, etc., both forms of meat are available: one which is produced in modern mechanized slaughterhouses, and the other from local butcher shops.
In some communities[which?] animal slaughter may be controlled by religious laws, most notably halal for Muslims and kashrut for Jewish communities. These both require that the animals being slaughtered should be conscious at the point of death, and as such animals cannot be stunned prior to killing. This can cause conflicts with national regulations when a slaughterhouse adhering to the rules of religious preparation is located in some Western countries. In Jewish law, captive bolts and other methods of pre-slaughter paralysis are generally not permissible, due to it being forbidden for an animal to be killed prior to slaughter. Various halal food authorities have more recently permitted the use of a recently developed fail-safe system of head-only stunning where the shock is less painful and non-fatal, and where it is possible to reverse the procedure and revive the animal after the shock. The use of electronarcosis and other methods of dulling the sensing has been approved by the Egyptian Fatwa Committee. This allows these entities to continue their religious techniques while keeping accordance to the national regulations.
In many societies,[which?] traditional cultural and religious aversion to slaughter led to prejudice against the people involved. In Japan, where the ban on slaughter of livestock for food[specify] was lifted only in the late 19th century, the newly found slaughter industry drew workers primarily from villages of burakumin, who traditionally worked in occupations relating to death (such as executioners and undertakers). In some parts of western Japan, prejudice faced by current and former residents of such areas (burakumin "hamlet people") is still a sensitive issue. Because of this, even the Japanese word for "slaughter" (屠殺 tosatsu) is deemed politically incorrect by some pressure groups as its inclusion of the kanji for "kill" (殺) supposedly portrays those who practice it in a negative manner.
Some countries[which?] have laws that exclude specific animal species or grades of animal from being slaughtered for human consumption, especially those that are taboo food. The former Indian Prime Minister Atal Bihari Vajpayee suggested in 2004 introducing legislation banning the slaughter of cows throughout India, as Hinduism holds cows as sacred and considers their slaughter unthinkable and offensive. This was often opposed on grounds of religious freedom. The slaughter of cows and the importation of beef into the nation of Nepal are strictly forbidden.
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Most countries have laws in regard to the treatment of animals at slaughterhouses. In the United States, there is the Humane Slaughter Act of 1958, a law requiring that all swine, sheep, cattle, and horses be stunned unconscious with application of a stunning device by a trained person before being hoisted up on the line. There is some debate over the enforcement of this act. This act, like those in many countries, exempts slaughter in accordance to religious law, such as kosher shechita and dhabiha halal. Most strict interpretations of kashrut require that the animal be fully sensible when its carotid artery is cut.
The novel The Jungle detailed unsanitary conditions in slaughterhouses and the meatpacking industry during the 1800s. This led directly to an investigation commissioned directly by President Theodore Roosevelt, and to the passage of the Meat Inspection Act and the Pure Food and Drug Act of 1906, which established the Food and Drug Administration. A much larger body of regulation deals with the public health and worker safety regulation and inspection.
In the year 1997 Gail Eisnitz, chief investigator for the Humane Farming Association (HFA), released a book Slaughterhouse. Within, she unveils the interviews of slaughterhouse workers in the U.S. who say that, because of the speed with which they are required to work, animals are routinely skinned while apparently alive, and still blinking, kicking, and shrieking. Eisnitz argues that this is not only cruel to the animals, but also dangerous for the human workers, as cows weighing several thousands of pounds thrashing around in pain are likely to kick out and debilitate anyone working near them.
This would imply that certain slaughter houses throughout the country are not following the guidelines and regulations spelled out by the Humane Slaughter Act, requiring all animals to be put down and thus insusceptible to pain by some form, typically electronarcosis, before undergoing any form of violent action.
According to the HFA, Eiznitz interviewed slaughterhouse workers representing over two million hours of experience, who, without exception, told her that they have beaten, strangled, boiled, and dismembered animals alive, or have failed to report those who do. The workers described the effects the violence has had on their personal lives, with several admitting to being physically abusive or taking to alcohol and other drugs.
The HFA alleges that workers are required to kill up to 1,100 hogs an hour, and end up taking their frustration out on the animals. Eisnitz interviewed one worker, who had worked in ten slaughterhouses, about pig production. He told her:
Hogs get stressed out pretty easy. If you prod them too much, they have heart attacks. If you get a hog in the chute that's had the shit prodded out of him and has a heart attack or refuses to move, you take a meat hook and hook it into his bunghole. You try to do this by clipping the hipbone. Then you drag him backwards. You're dragging these hogs alive, and a lot of times the meat hook rips out of the bunghole. I've seen hams — thighs — completely ripped open. I've also seen intestines come out. If the hog collapses near the front of the chute, you shove the meat hook into his cheek and drag him forward.
Historically, some doubted that fish could experience pain. However, laboratory experiments have shown that fish do react to painful stimuli (e.g. injections of bee venom) in a similar way to mammals. The expansion of fish farming as well as animal welfare concerns in society has led to research into more humane and faster ways of killing fish. In large-scale operations like fish farms, stunning fish with electricity or putting them into water saturated with nitrogen so that they cannot breathe, results in death more rapidly than just taking them out of the water. For sport fishing, it is recommended that fish be killed soon after catching them by hitting them on the head followed by bleeding out, or by stabbing the brain with a sharp object (called pithing or ike jime in Japanese).
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