CO2 gassing
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Carbon dioxide stunning is a method commonly used in the pig slaughter industry to render the animals unconscious prior to slaughter. This method involves exposing pigs to high concentrations of carbon dioxide gas, which induces unconsciousness and ultimately death.
The use of carbon dioxide as a stunning agent has become increasingly popular due to its relatively low cost. During the process pigs exhibit signs of distress such as vocalizations and attempts to escape the chamber.