The killing of pigs by exposure to carbon dioxide
3.—(1) Subject to paragraphs 4 to 6, pigs may be killed at a slaughterhouse by exposure to carbon dioxide gas mixture in a chamber provided for the purpose (hereinafter referred to as “a chamber”).
(2) For the purposes of this Part, a carbon dioxide gas mixture (hereinafter referred to as the “gas mixture”) shall mean at least 70% carbon dioxide by volume in atmospheric air.