The killing of birds by exposure to gas mixtures
7.—(1) Subject to paragraphs 8 to 10, birds may be killed at a slaughterhouse by exposure to an anoxic gas mixture which rapidly renders birds insensible to pain or distress in a chamber provided for the purpose (hereinafter referred to as “a chamber”).
(2) In this Part “gas mixture” means either—
(a)a maximum of 2% total oxygen by volume and 90% argon (or other inert gas) by volume in atmospheric air; or
(b)25% to 30% carbon dioxide by volume and 60% argon (or other inert gas) by volume in atmospheric air.