Animal Welfare in On-Farm Euthanasia Methods
Summary
On-farm euthanasia is a cornerstone of responsible livestock and poultry management, providing a humane end-of-life solution for animals that are diseased, injured or surplus to production. Methods range from physical interventions, such as captive bolt devices and cervical dislocation, to chemical approaches using inert or narcotic gases, most commonly carbon dioxide. The primary welfare objective is the rapid induction of unconsciousness followed by swift, irreversible cessation of vital functions with minimal pain and distress. Key considerations include the choice of method suitable to species and size, operator training and skill, inspection of animal responses to confirm insensibility, and adherence to ethical and regulatory standards. Emerging research seeks to refine techniques, improve welfare outcomes through standardised assessment of consciousness states and integrate practical solutions for emergency mass depopulation scenarios. Globally, the implementation of best practice protocols enhances animal welfare, supports disease control measures and reinforces public confidence in animal production systems.
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Animal Welfare in On-Farm Euthanasia Methods publication trend
The graph below shows the total number of articles in animal welfare in on-farm euthanasia methods across all publications each year (not limited to Nature Index journals).
Technical terms
On-farm euthanasia: The deliberate ending of an animal’s life at the site of rearing, using methods deemed humane and practical for that context.
Depopulation: The rapid reduction or removal of a population of animals, often in response to disease outbreaks or emergency management situations.
Consciousness state: The neurological condition indicating awareness and sensory perception; its loss is the primary indicator of effective stunning or euthanasia.
Cervical dislocation: A physical method of euthanasia in which the spinal cord is severed at the neck, leading to rapid unconsciousness and death.
Stunning: The application of physical or chemical means to render an animal insensible to pain prior to euthanasia or slaughter.
References
- A Systematic Literature Review on Depopulation Methods for Swine. Animals (2020).
- Review: Potential alternatives to high-concentration carbon dioxide stunning of pigs at slaughter. Animal (2021).
- Euthanasia: Manual versus Mechanical Cervical Dislocation for Broilers. Animals (2019).
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