The use of Mixtures of the Gases CO2, O2, and N2 for Stunning or Killing Poultry - Report of the Scientific Committee on Animal Health and Animal Welfare adopted 23rd June 1998

2. In the case of poultry, the Committee considered two methods for gas stunning and killing poultry (Argon 1: >90% argon in air; Argon 2: a mixture of >60% argon and 30% CO2 in air). Insufficient scientific information was available to consider other gas mixtures that could be used for stunning poultry species, although there was some evidence that some methods using carbon dioxide were inadequate. Reference was also made, at that time, to research which was underway into stunning or killing of poultry using mixtures of carbon dioxide, oxygen, and nitrogen.