They said: "when they're culled we lower the temperature so that there's no violent death or change in state (because insects are exothermic their metabolism sl

They said: "when they're culled we lower the temperature so that there's no violent death or change in state (because insects are exothermic their metabolism slows until they go into a coma-like sleep without any pain)." Not sure how they determine the pain thing, but that's apparently how it works.