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Facility where animals are slaughtered for meat

In livestock agriculture and the meat industry, a slaughterhouse, also called an abattoir (/audio=En us abattoir. ogg//'//æ//b//@//t//w//ɑr/), is a facility where livestock animals are slaughtered to provide food. Slaughterhouses supply meat, which then becomes the responsibility of a meat packing facility. Slaughterhouses that produce meat that is not intended for human consumption are sometimes referred to as knacker's yards or knackeries. This is where animals are slaughtered that are not fit for human consumption or that can no longer work on a farm, such as retired work horses. Slaughtering animals on a large scale poses significant issues in terms of logistics, animal welfare, and the environment, and the process must meet public health requirements. Due to public aversion in different cultures, determining where to build slaughterhouses is also a matter of some consideration. Frequently, animal rights groups raise concerns about the methods of transport to and from slaughterhouses, preparation prior to slaughter, animal herding, stunning methods, and the killing itself.

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 or under cover such as wet markets. A term for such open air slaughterhouses was shambles, and there are streets named "The Shambles" in some English and Irish towns (e. g., Worcester, York, Bandon) which got their name from having been the site on which butchers killed and prepared animals for consumption. Fishamble Street, Dublin was formerly a fish shambles. Sheffield had 183 slaughterhouses in 1910, and it was estimated that there were 20,000 in England and Wales.

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 unsanitary slaughterhouses in 1890). Yet the appointment of slaughterhouse inspectors and the establishment of centralised abattoirs took place much earlier in the British colonies, such as the colonies of New South Wales and Victoria, and in Scotland where 80% of cattle were slaughtered in public abattoirs by 1930. In Victoria the Melbourne Abattoirs Act 1850 (NSW) "confined the slaughtering of animals to prescribed public abattoirs, while at the same time prohibiting the killing of sheep, lamb, pigs or goats at any other place within the city limits". Animals were shipped alive to British ports from Ireland, from Europe and from the colonies and slaughtered in large abattoirs at the ports. Conditions were often very poor. Attempts were also made throughout the British Empire to reform 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 fewer 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 the meat packing industry: "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. The development of slaughterhouses was linked with industrial expansion of by products. By 1932 the British by product industry was worth about £97 million a year, employing 310,000 people. The Aberdeen slaughterhouse sent hooves to Lancashire to make glue, intestines to Glasgow for sausages and hides to the Midland tanneries. In January 1940 the British government took over the 16,000 slaughterhouses and by 1942 there were only 779.

In the latter part of the 20th century, the layout and design of most U. S. slaughterhouses was influenced by the work of 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.

Beginning in 2008 the Local Infrastructure for Local Agriculture, a non profit committed to revitalizing opportunities for "small farmers and strengthening the connection between local supply and demand", constructed a mobile slaughterhouse facility in efforts for small farmers to process meat quickly and cost effectively. Named the Modular Harvest System, or M. H. S., it received USDA approval in 2010. The M. H. S. consists of three separate 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. In some societies, 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 was lifted 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 practise it in a negative manner. Some countries 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.

Refrigeration technology allowed meat from the slaughterhouse to be preserved for longer periods. This led to the concept as the slaughterhouse as a freezing works. Prior to this, canning was an option. Freezing works are common in New Zealand, Australia and South Africa. In countries where meat is exported for a substantial profit the freezing works were built near docks, or near transport infrastructure. Mobile poultry processing units (MPPUs) follow the same principles, but typically require only one trailer and, in much of the United States, may legally operate under USDA exemptions not available to red meat processors. Several MPPUs have been in operation since before 2010, under various models of operation and ownership.

Most countries have laws in regard to the treatment of animals in 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 presented a fictionalized account of 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 1997, Gail Eisnitz, chief investigator for the Humane Farming Association (HFA), released the 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 slaughterhouses 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. Animal rights activists, anti speciesists, vegetarians and vegans are prominent critics of slaughterhouses and have created events such as the march to close all slaughterhouses to voice concerns about the conditions in slaughterhouses and ask for their abolition. Some have argued that humane animal slaughter is impossible.

American slaughterhouse workers are three times more likely to suffer serious injury than the average American worker. NPR reports that pig and cattle slaughterhouse workers are nearly seven times more likely to suffer repetitive strain injuries than average. The Guardian reports that on average there are two amputations a week involving slaughterhouse workers in the United States. On average, one employee of Tyson Foods, the largest meat producer in America, is injured and amputates a finger or limb per month. The Bureau of Investigative Journalism reported that over a period of six years, in the UK 78 slaughter workers lost fingers, parts of fingers or limbs, more than 800 workers had serious injuries, and at least 4,500 had to take more than three days off after accidents. In a 2018 study in the Italian Journal of Food Safety, slaughterhouse workers are instructed to wear ear protectors to protect their hearing from the loud noises in the facility. A 2004 study in the Journal of Occupational and Environmental Medicine found that "excess risks were observed for mortality from all causes, all cancers, and lung cancer" in workers employed in the New Zealand meat processing industry.

Slaughterhouse workers have a higher prevalence rate of mental health distress, including anxiety, detachment, depression, emotional numbing, perpetrator trauma, psychosocial distress, and PTSD, violence supportive attitudes, and an increased crime levels. Slaughterhouse Workers have adaptive and maladaptive strategies to cope with the workplace environment and associated stressors. Working at slaughterhouses often leads to a high amount of psychological trauma. A 2016 study in Organization indicates, "Regression analyses of data from 10,605 Danish workers across 44 occupations suggest that slaughterhouse workers consistently experience lower physical and psychological well being along with increased incidences of negative coping behavior." A 2009 study by criminologist Amy Fitzgerald indicates, "slaughterhouse employment increases total arrest rates, arrests for violent crimes, arrests for rape, and arrests for other sex offenses in comparison with other industries." As authors from the PTSD Journal explain, "These employees are hired to kill animals, such as pigs and cows that are largely gentle creatures. Carrying out this action requires workers to disconnect from what they are doing and from the creature standing before them. This emotional dissonance can lead to consequences such as domestic violence, social withdrawal, anxiety, drug and alcohol abuse, and PTSD."

Starting in the 1980s, Cargill, Conagra Brands, Tyson Foods and other large food companies moved most slaughterhouse operations to rural areas of the Southern United States which were more hostile to unionization efforts. Slaughterhouses in the United States commonly illegally employ and exploit underage workers and undocumented immigrants. In 2010, Human Rights Watch described slaughterhouse line work in the United States as a human rights crime. In a report by Oxfam America, slaughterhouse workers were observed not being allowed breaks, were often required to wear diapers, and were paid below minimum wage.