Exsanguination is the loss of blood from the circulatory system of a vertebrate, usually leading to death. The word comes from the Latin 'sanguis', meaning blood, [1] and the prefix 'ex-', meaning 'out of'.
Exsanguination has long been used as a method of animal slaughter. Humane slaughter must ensure the animal is rendered insensible to pain, whether through a captive bolt or other process, prior to the bloodletting.
Depending upon the health of the individual, a person usually dies from losing half to two-thirds of their blood; a loss of roughly one-third of the blood volume is considered very serious. Even a single deep cut can warrant suturing and hospitalization, especially if trauma, a vein or artery, or another comorbidity is involved. In the past, bloodletting was a common medical procedure or therapy, now rarely used in medicine.
Exsanguination is used as a slaughter method. Before the fatal incision is made, the animal will be rendered insensible to pain by various methods, including captive bolt, electricity, or chemical. Electricity is used mostly to incapacitate swine, poultry, and domestic sheep, whereas a chemical is used for injured livestock.[ citation needed ]
Without prior sedation, stunning, or anesthetic, this method of slaughter may cause a high degree of anxiety, depending on the process. How animals are handled and restrained before slaughter likely impacts their welfare more than whether or not they are stunned. [2] If done badly, there can be a large element of cruelty involved, [3] [4] [5] whereas killing under the correct conditions minimizes the pain or suffering, if any, inflicted upon the animal. [6] [7] [8]
Continued pumping operation of the heart during exsanguination increases the rate of depletion and thus hastens death by raising the fluid pressure of the blood. Because the heart operates like a positive displacement pump, blood volume reduction will not affect cardiac output efficiency. Deprivation of blood to the heart does gradually result in diminished function, but concurrently with similar death of other parts in the body as blood volume declines.
Quickly after the animal is incapacitated, a very sharp knife, in an orientation parallel to the ground, is inserted through the skin just in front of the point of the jaw and below the vertebrate. From this position, the knife is drawn forward away from the spine to sever the jugular veins, carotid arteries, and trachea. Properly performed, blood will flow freely, and death will occur within seconds. Sheep and duck will reach heart and liver malfunction, leading to death, in under 10 seconds; larger animals, notably cattle, may take up to 40 seconds to reach brain death. This period may extend to a couple of minutes if complications, such as arterial occlusion, occur. However, the animal's inverted position allows blood to flow more precipitously, thus making it highly unlikely for an animal to regain consciousness before it is fully exsanguinated. In any case, animal welfare advisory councils clearly emphasize that the time from incapacitation to the start of exsanguination should be prompt, recommending a time under 15 seconds. [9]
Beyond the initial cost of purchasing a captive bolt, continued usage of the method is very inexpensive. The animal is incapacitated for the duration of the procedure, so it is one of the safest methods for the slaughterer.
Jewish kashrut (kosher) and Islamic dhabihah (halal) dietary laws mandate that slaughter is performed with a cut that immediately severs the esophagus, trachea, and the large blood vessels in the neck, causing loss of consciousness and death by exsanguination. The double-edged pointed knife is prohibited. Instead, a long knife with a squared-off end is used that, in Jewish law, must be at least twice the width of the animal's neck. The operation of sticking or exsanguination is executed faster than when using the pointed knife, as four large blood vessels in the neck are severed simultaneously.
In Islamic and Jewish law, captive bolts and other methods of pre-slaughter paralysis are not permissible, as consumption of animals found dead are regarded as carrion and stunned animals that are later killed fall into this category.[ citation needed ] Various halal food authorities have more recently permitted the use of a recently developed fail-safe system of head-only stunning using a mushroom-shaped hammerhead that delivers a blow that is not fatal, proved by it being possible to reverse the procedure and revive the animal after the shock. [10]
Such methods, particularly involving unstunned animals, have been criticized by veterinarians and animal welfare organizations, among others. Prohibitions against unstunned slaughter have been enacted in several countries. See Animal welfare controversies in shechita for further information.
Some methods of suicide, e.g., wrist slitting, rely on exsanguination as the mechanism of death.
In livestock agriculture and the meat industry, a slaughterhouse, also called an abattoir, is a facility where livestock animals are slaughtered to provide food. Slaughterhouses supply meat, which then becomes the responsibility of a meat-packing facility.
Halal is an Arabic word that translates to 'permissible' in English. In the Quran, the term halal is contrasted with the term haram. It is used to refer to actions, behaviors, or items that are allowed under the teachings of Islam. Halal applies not only to food but also to various aspects of life, including finance, clothing, and behavior. Its opposite is haram, which means "forbidden" or "unlawful". The concept of halal is central to Islamic practices and is derived from the Quran and the Sunnah. The guidelines for what is considered halal or haram are laid out in Islamic jurisprudence (fiqh), and scholars interpret these guidelines to ensure compliance with Islamic principles.
In Judaism, shechita is ritual slaughtering of certain mammals and birds for food according to kashrut.
Kosher foods are foods that conform to the Jewish dietary regulations of kashrut. The laws of kashrut apply to food derived from living creatures and kosher foods are restricted to certain types of mammals, birds and fish meeting specific criteria; the flesh of any animals that do not meet these criteria is forbidden by the dietary laws. Furthermore, kosher mammals and birds must be slaughtered according to a process known as shechita and their blood may never be consumed and must be removed from the meat by a process of salting and soaking in water for the meat to be permissible for use. All plant-based products, including fruits, vegetables, grains, herbs and spices, are intrinsically kosher, although certain produce grown in the Land of Israel is subjected to other requirements, such as tithing, before it may be consumed.
A captive bolt pistol is a device used for the stunning of animals prior to slaughter.
Stunning is the process of rendering animals immobile or unconscious, with or without killing the animal, when or immediately prior to slaughtering them for food.
The Humane Slaughter Act, or the Humane Methods of Livestock Slaughter Act, is a United States federal law designed to decrease suffering of livestock during slaughter. It was approved on August 27, 1958. The most notable of these requirements is the need to have an animal completely sedated and insensible to pain. This is to minimize the suffering to the point where the animal feels nothing at all, instead blacking out and never waking. This differs from animal to animal as size increases and decreases. Larger animals such as bovines require a stronger method than chickens, for example. Bovines require electronarcosis or something equally potent, though electronarcosis remains a standard. The bovine would have a device placed on their head that, once activated, sends an electric charge that efficiently and safely stuns them. Chickens, on the other hand, require much less current to be efficiently sedated and are given a run under electrically charged water. To ensure that these guidelines are met, the Food Safety and Inspection Service inspectors at slaughtering plants are responsible for overseeing compliance, and have the authority to stop slaughter lines and order plant employees to take corrective actions. Although more than 168 million chickens and around 9 billion broiler chickens are killed for food in the United States yearly, the Humane Slaughter Act specifically mentions only cattle, calves, horses, mules, sheep and swine.
The killing of animals is animal euthanasia, animal sacrifice, animal slaughter, hunting, blood sports, roadkill or self-defense.
Hullin or Chullin is the third tractate of the Mishnah in the Order of Kodashim and deals with the laws of ritual slaughter of animals and birds for meat in ordinary or non-consecrated use, and with the Jewish dietary laws in general, such as the laws governing the prohibition of mixing of meat and dairy.
In Islamic law, dhabihah, also spelled zabiha, is the prescribed method of slaughter for halal animals. It consists of a swift, deep incision to the throat with a very sharp knife, cutting the wind pipe, jugular veins and carotid arteries on both sides but leaving the spinal cord intact. The butcher is also required to call upon the name of Allah individually for each animal.
The Islamic dietary laws (halal) and the Jewish dietary laws are both quite detailed, and contain both points of similarity and discord. Both are the dietary laws and described in distinct religious texts: an explanation of the Islamic code of law found in the Quran and Sunnah and the Jewish code of laws found in the Torah, Talmud and Shulchan Aruch.
The legal aspects of ritual slaughter include the regulation of slaughterhouses, butchers, and religious personnel involved with traditional shechita (Jewish) and dhabiha (Islamic). Regulations also may extend to butchery products sold in accordance with kashrut and halal religious law. Governments regulate ritual slaughter, primarily through legislation and administrative law. In addition, compliance with oversight of ritual slaughter is monitored by governmental agencies and, on occasion, contested in litigation.
Wilhelm Schulze was a German professor of veterinary medicine and director of the University of Veterinary Medicine Hanover who specialized in pigs.
Jhatka is the meat from an animal killed by a single strike of a sword or axe to sever the head within the Dharmic Sikh religion, which kills the animal almost instantly as opposed to other forms of slaughter. This type of slaughter is preferred by most meat-consuming Sikhs. Also within this method of butchering the animal must not be scared or shaken before the slaughter but given a dignified, painless death.
Animal slaughter is the killing of animals, usually referring to killing domestic livestock. It is estimated that each year, 80 billion land animals are slaughtered for food. Most animals are slaughtered for food; however, they may also be slaughtered for other reasons such as for harvesting of pelts, being diseased and unsuitable for consumption, or being surplus for maintaining a breeding stock. Slaughter typically involves some initial cutting, opening the major body cavities to remove the entrails and offal but usually leaving the carcass in one piece. Such dressing can be done by hunters in the field or in a slaughterhouse. Later, the carcass is usually butchered into smaller cuts.
Ritual slaughter is the practice of slaughtering livestock for meat in the context of a ritual. Ritual slaughter involves a prescribed practice of slaughtering an animal for food production purposes.
Bloodletting is a formerly common medical procedure now generally abandoned.
Tza'ar ba'alei chayim, literally "suffering of living creatures", is a Jewish commandment which bans causing animals unnecessary suffering. This concept is not clearly enunciated in the written Torah, but was accepted by the Talmud as being a biblical mandate. It is linked in the Talmud from the biblical law requiring people to assist in unloading burdens from animals.
Fish slaughter is the process of killing fish, typically after harvesting at sea or from fish farms. At least one trillion fish are killed each year for commercial consumption. Some fish harvesting uses controversial methods like suffocation in air, carbon-dioxide stunning, or ice chilling that have been called inhumane by many organizations such as the World Organisation for Animal Health. However, due to many culture's reliance on fish, some alternative methods of slaughter have been developed, including percussive stunning, pithing, shooting, and electrical stunning. While these methods are considered effective, they still face criticism, with some arguing that no method of fish slaughter can ever be truly humane.
The Humane Slaughter Association (HSA) supports research, training, and development to improve the welfare of livestock during transport and slaughter. It provides technical information about handling and slaughter on its website, training for farmer staff and vets, advice to governments and industry, and funding of science and technology to make slaughter more humane. HSA is the sister charity to Universities Federation for Animal Welfare.