Controlled-atmosphere killing

Controlled-atmosphere killing is a way to kill animals, like chickens or pigs, in a way that's supposed to be less painful or scary for them. It involves putting the animals in a room or container that has a specific mixture of gases, like carbon dioxide or nitrogen. The amount and type of gases used can vary depending on the animal and the way it's being killed.

The gases in the room work to make the animals unconscious, so they're not awake or aware when they're being killed. This is different from other methods of killing animals that might involve using things like electric shocks or cutting their throats while they're still conscious.

Controlled-atmosphere killing is supposed to be a more humane way of killing animals, but some people think it's still not the best way to do it. They might argue that it's still scary or stressful for the animals to be put in the container with the gases, or that some of the gases used can actually cause pain or discomfort before they become unconscious.

Overall, controlled-atmosphere killing is a way that some people try to make sure animals don't suffer when they're killed for food or other products, but there are still debates about whether it's the best way to do it.