# The Welfare of Animals (Slaughter or Killing) Regulations 1995, Paragraph 7

Extent: S

Birds may only be killed by exposure to gas mixtures elsewhere than in a slaughterhouse in accordance with the combinations of gas mixtures and chamber specified in the table below.
Combination table
Gas mixture
Chamber
Combination 1
Carbon dioxide in a concentration of not less than 45% carbon dioxide by volume in atmospheric air.
bird shed
Combination 2
Carbon dioxide in a concentration of not less than 45% carbon dioxide by volume in atmospheric air.
gas container
Combination 3
Any mixture of argon and carbon dioxide, or other inert gas and carbon dioxide, in atmospheric air where–
(a)the concentration of the argon, or the other inert gas, does not exceed 80% by volume;
(b)the concentration of carbon dioxide does not exceed 20% by volume; and
(c)the final concentration of oxygen does not exceed 5% by volume.
gas container

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Source: https://www.legislation.gov.uk/uksi/1995/731/schedule/7A/paragraph/7 (the official version)
Page: https://openlegislation.uk/welfare-of-animals-slaughter-or-killing-regulations-1995/schedule-7A/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.