UK to Phase Out CO2 Pig Stunning After Welfare Review
On 26 October 2026, the UK government said it wants to phase out high-concentration carbon dioxide stunning for pigs before slaughter. If that sounds technical, the simple point is this: ministers say the current method can cause fear, panic and breathing distress before the animal loses consciousness. That matters because stunning is meant to reduce suffering, not add to it. In the government announcement on gov.uk, ministers said the plan sits within a wider animal welfare strategy aimed at improving how farmed animals are treated throughout their lives, including at the point of slaughter.
The welfare case is at the centre of the proposal. Pigs are widely recognised as sentient animals, which means they can feel pain and fear. According to the government summary, independent evidence has raised serious concerns about what pigs experience when they are exposed to high concentrations of carbon dioxide. Madeline Campbell, chair of the Animal Welfare Committee, said the committee’s view was clear: when more humane and legal alternatives exist, continuing with high-concentration CO2 is not acceptable on animal welfare grounds. That is strong language, and it tells you this is not a minor technical tidy-up. It is a response to a method that experts believe causes avoidable suffering.
If you are new to this issue, it helps to separate two questions. The first is whether pigs are stunned before slaughter. The second is how that stunning is done. The proposal does not argue against stunning itself. It argues against one particular method. **What this means for you:** a stun is meant to render an animal unconscious so it does not feel pain during slaughter. The criticism here is about the period before unconsciousness. Government advisers and welfare campaigners say high-concentration CO2 can trigger panic and breathing difficulty in that window, which is why the method has come under such heavy criticism.
The government says there are more humane alternatives already allowed in law. The two named in the announcement are argon gas and automated electrical stunning. According to ministers, both are proven to reduce animal suffering substantially compared with high-concentration carbon dioxide. That does not mean the switch is effortless. Slaughterhouses across the pork industry may need new equipment, new training and time to change their systems safely. This is why the plan is a phase-out rather than an overnight ban.
This is also where the consultation matters. A consultation is the stage where government asks people and organisations to comment before final decisions are made. It is not the same as a law coming into force tomorrow. **What a consultation means:** it is the point where welfare evidence, business costs and practical problems are tested in public. In this case, the consultation opened on 26 October 2026 and runs until 21 December 2026. According to the government, it asks for views on the welfare gains, the cost to businesses, how practical the alternatives are and how quickly the sector could move away from CO2.
The announcement also makes clear that officials have not arrived at this suddenly. Since April 2024, the government says it has been working with pig processors, equipment manufacturers, gas suppliers and animal welfare organisations to test what a transition might look like in practice. That matters because animal welfare policy is strongest when it deals honestly with logistics as well as principle. If a new system is better for animals but impossible to install quickly, the timetable has to reflect that. Farming Minister Stephen Morgan said the government wants to support farmers and businesses through the change and keep the long-term benefits in view.
There is another reason in the background too. The government says moving away from carbon dioxide would reduce the sector’s dependence on a gas supply that can be shaken by international events. Earlier in 2026, concerns about shortages linked to conflict in the Middle East exposed how vulnerable those supply chains can be. This does not replace the welfare argument, but it does strengthen the case for change. A system that is kinder to animals and less exposed to global disruption is easier for ministers and businesses to defend.
For readers, this is a useful example of how animal welfare policy often works: science raises concerns, an expert committee weighs the evidence, ministers consult the sector, and only then does a formal change start to take shape. It can look slow from the outside, but the detail matters because the consequences reach farms, slaughterhouses, food businesses and shoppers. The big question now is not whether the government thinks high-concentration CO2 is a problem. The announcement makes that clear. The next question is whether the consultation produces a workable route to replace it at speed. If it does, this could become one of the most important changes to farm animal welfare rules in Britain for years.