Molly Ayala
The slaughtering of animals is a highly controversial topic, with animal rights advocates criticising the treatment of animals in slaughterhouses. The process of slaughter typically involves stunning the animal first to render them unconscious, before shackling and hoisting them to begin the slaughter process. Common methods of stunning include the use of a captive bolt gun, gas, or electricity. Electrocution is a standard practice in slaughterhouses, with the electronarcosis method being widely acclaimed as the safest, most humane, and most reliable way to stun animals. This method is used on larger animals such as cattle, calves, and sheep, as well as on birds like chickens and hens, who are hung upside down and passed through electrified water. However, there have been concerns raised about the effectiveness of stunning, with some animals remaining conscious during the slaughter process.
| Characteristics | Values |
|---|---|
| Purpose | To kill animals for food production |
| Animals Killed | Cattle, sheep, pigs, calves, chickens, birds, hens |
| Methods | Electrical stunning, penetrating captive bolt, gas stunning/killing, shackling, electrified water, shooting, gassing |
| Location | Brazil, Canada, US (North Carolina), Arkansas, South Carolina, Maryland, Minnesota, Iowa, South Dakota, UK, EU |
| Issues | Animal cruelty, labor violations, mistreatment of workers, increased crime rates, animal consciousness during slaughter, botched killings |
| Regulations | EU legislation (Directive 93/119/EC), US Human Slaughter Act, UK law |
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What You'll Learn
Electric current passed through the brain
The use of electricity to kill animals in slaughterhouses is a two-stage application that involves passing an electric current through the animal's brain to stun it, followed by cardiac arrest. This method is used on young and adult sheep, goats, calves, and pigs over one week old.
The process begins with the application of an electric current to the animal's head using scissor-type tongs, which causes unconsciousness and seizures. During this tonic phase, the animal collapses, stops breathing, and extends its front legs rigidly while flexing its hind legs into the body. The second stage involves immediately applying the tongs across the chest, spanning the heart, to induce cardiac arrest. The heart is particularly susceptible to low-frequency currents, such as 50 Hz, which cause ventricular fibrillation. In this state, the heart's muscle fibres contract in a rapid, uncoordinated manner, stopping blood circulation and leading to death.
It is important to note that the application of electricity must induce unconsciousness. If the current bypasses the brain or is insufficient, it is not considered humane, even if the animal dies. Therefore, the person performing the kill should ensure the absence of brainstem reflexes for every animal. If there is any doubt about the success of the stun or kill, an alternative method, such as a free-bullet firearm or captive-bolt followed by pithing, should be used immediately.
Compared to other methods, the use of electricity to stun and kill animals offers several advantages. It reduces the risk to biosecurity, as the skin remains unbroken, minimising the concern of contagious pathogens entering and contaminating the environment. Additionally, the brain can stay intact, allowing for potential diagnostic analysis post-mortem. This method is also less hazardous for handlers and killing personnel, as post-stun/kill convulsions are reduced, thereby decreasing the risk to human safety.
However, there are also disadvantages to this method. It requires a reliable supply of electricity, and the electrodes must be applied and maintained in the correct positions to be effective. Additionally, the use of electrical stunning should adhere to the Humane Methods of Slaughter Act, which mandates the humane treatment and handling of food animals while providing a quick and effective death.
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Electric water baths for poultry
Electric water baths are used to stun poultry before slaughter. This method is often used for large numbers of birds such as quails, chickens, ducks, geese, and turkeys. The birds are hung upside down by their legs on metal shackles along a moving conveyor belt. They are then moved to a water bath that stuns them. When the bird's head touches the water, an electrical circuit is completed, and the bird is stunned.
The electrical parameters (voltage, current, frequency, and waveform) of a water bath system can be set to either stun or stun-kill the birds. The current should be at least 100 mA for each individual bird. The quality of contact between the bird and the electrodes, the number of birds in the water bath, the duration of the stun, the amount of current entering the bird, the waveform, frequency, and voltage applied all influence the effectiveness of the stun.
There are some welfare concerns with this method, particularly regarding waterfowl. Waterfowl can curl their necks and lift their heads, which may result in them experiencing an electric current without losing consciousness. There is also a risk of pre-stun shocks if the bird's wings or beak enter the water first, which can cause pain and prevent effective stunning.
Research and evidence on the recommended settings for waterfowl are currently limited, and alternative methods may be more suitable for humanely killing these animals.
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Cruelty in slaughterhouses
Slaughterhouses are places where farmed animals are taken to be killed, usually for food production. While the method of slaughter varies depending on the species, location, and local laws, it is undeniable that slaughterhouses cause immense suffering to billions of farmed animals. Investigations have revealed routine animal abuse within these facilities, exposing the truth and prompting calls for positive change.
Animal Equality, for instance, has conducted multiple investigations that document the cruelty endured by animals in slaughterhouses. In 2023, they released footage from a Canadian slaughterhouse, showing employees cramming cows into a narrow hallway and prodding them even when they had no space to move. Similarly, in 2019, their investigation of a British sheep slaughterhouse, Farmers Fresh Wales, revealed unimaginable cruelty and suffering. Another investigation by Animal Equality in Italy showed the terrible cruelty that pigs experience inside a slaughterhouse. These instances highlight the secrecy and routine acceptance of animal abuse in slaughterhouses.
The impact of slaughterhouses extends beyond animal cruelty, as they also cause suffering to humans. Labor violations, mistreatment of workers, and increased crime rates, including domestic violence, sexual assault, and child abuse, have been linked to the presence of slaughterhouses in communities. For example, during the COVID-19 pandemic, the Tyson Foods pig slaughterhouse in Waterloo, Iowa, became a hotspot for the virus, with a devastating impact on the community. The failure of regulatory oversight in the US slaughter industry has contributed to dangerous conditions for workers, environmental degradation, and severe animal suffering.
To address these issues, there have been calls for additional regulation and oversight of slaughterhouses to reduce unnecessary pain and suffering. The creation of a federal Slaughterhouse Oversight Commission has been proposed to strengthen the rights, health, and well-being of both humans and animals affected by the industry. While some slaughterhouses attempt to stun animals before slaughter, this process is often botched, causing the animals unnecessary pain. Therefore, additional regulations that prioritize the welfare of both workers and animals are crucial to mitigating the cruelty associated with slaughterhouses.
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EU regulations for animal welfare
Animal welfare is a crucial aspect of slaughterhouses, and EU regulations aim to ensure the humane treatment and handling of animals during the slaughter process. Here is an overview of the EU regulations pertaining to animal welfare in slaughterhouses:
Ante-Mortem Inspection:
Upon arrival at a slaughterhouse, a veterinarian examines the health and well-being of each animal. Sick or injured animals that cannot walk are not permitted to be slaughtered for human consumption. A slaughter permit is issued for each healthy animal.
Stunning Methods:
EU regulations allow for various stunning methods to render animals insensible to pain before they are killed. These include penetrating captive bolts, electrical stunning, and gas stunning. The regulation limits certain methods, such as restricting carbon dioxide use to under 40% for poultry stunning. The use of water bath stunners for poultry is also permitted, despite its welfare disadvantages, due to the lack of practical alternatives for small and medium-sized slaughterhouses.
Animal Welfare Officers:
Slaughterhouses are required to designate Animal Welfare Officers who ensure compliance with EU regulations. These officers are present during unloading, driving, stunning, and killing procedures, providing advice on improvements to minimise animal stress and suffering.
Staff Competence:
Staff handling animals must be competent and specially educated in their profession. They are trained to handle animals with minimal excitement and discomfort, reducing the use of electric prods and other implements that may cause injury or distress.
Monitoring and Verification:
Slaughterhouses must establish monitoring procedures to verify the efficiency of the stunning process. This includes monitoring lesions observed after slaughter and inspecting meat quality, such as fleshiness, fatness, and colour.
Approved Slaughter Locations:
Animals may only be slaughtered in approved locations that comply with construction requirements, including the accommodation and transport of animals, food safety, hygiene, and environmental considerations.
Food Chain Information:
The Food Chain Information system provides details about the livestock farm, the health status of the herd, veterinary medicine use, and previous meat inspection results. This information is used for meat inspections and ensures traceability and accountability in the food chain.
Specific Risk Material (SRM):
Parts of an animal's body that pose a risk to public health, such as the brain and spinal cord of adult bovine animals in the case of BSE (bovine spongiform encephalopathy), must be destroyed and not processed into food for humans or animals.
Import Requirements:
Meat imported into the EU must be accompanied by an attestation certifying that requirements equivalent to EU standards have been met. Third countries exporting meat to the EU must comply with similar welfare standards, taking into account the guidelines set by the World Organisation for Animal Health.
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Stunning methods
Stunning is a method used in slaughterhouses to render animals unconscious before they are killed. The three most common methods of stunning are mechanical, electrical, and carbon dioxide (CO2) gas.
Mechanical Stunning
Mechanical stunning involves firing a bolt through the skull of the animal using a pneumatic device or pistol. This method is used on cattle, sheep, and some pigs.
Electrical Stunning
Electrical stunning passes an electric current through the brain of the animal, causing a temporary loss of consciousness. This method is used on sheep, calves, and pigs. The minimum amperages for effective electrical stunning are 1 amp for sheep, 1.25 amps for pigs, and 1.5 amps for cattle. Some systems also pass the current through the heart, which can result in the death of the animal.
Gas Stunning
Gas stunning involves exposing the animal to high concentrations of gas, such as carbon dioxide or a mixture of gases. This method is used on pigs and poultry. For poultry, birds are hung upside down by their legs on metal shackles along a moving conveyor belt. They are then moved to a water bath that stuns them when their heads touch the water, completing an electrical circuit.
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Frequently asked questions
Electrical slaughter involves passing an electric current through an animal's brain, causing a temporary loss of consciousness. This method is used on sheep, calves, and pigs.
A large pair of tongs are used to pass an electric current through the animal's brain, causing it to lose consciousness immediately. Some systems also pass the current through the heart, resulting in death.
EU legislation, such as Directive 93/119/EC, provides regulations for animal welfare at the time of killing. The new regulation includes standardized procedures for animal welfare and requires regular monitoring of stunned animals to ensure they do not regain consciousness before slaughter.
Yes, other methods of stunning include penetrating captive bolt and gas stunning. Penetrating captive bolt is used on cattle, sheep, and some pigs, where a metal bolt is fired into the brain, causing immediate unconsciousness. Gas stunning, used on pigs, involves exposing them to high concentrations of gas, typically carbon dioxide.
Yes, there are concerns about animal welfare in slaughterhouses, including the use of cruel and inhumane practices. Investigations have revealed instances of animal abuse, such as workers kicking and beating cows, and the use of electric prods to herd animals. In some cases, animals are scalded, drowned, or left to freeze to death. These incidents highlight the need for better regulation and oversight of slaughterhouses to reduce unnecessary pain and suffering.
