In May 2013, the results of the assessment of the Anoxia Method were published in Poultry Science (2013 Poultry Science 92:1145–1154). The focus of the assessment was on the welfare implications for poultry of the use of high-expansion gas-filled foam as a potentially humane, emergency killing method.
In laboratory trials, broiler chickens, adult laying hens, ducks, and turkeys were exposed to air-, N2-, or CO2-filled high expansion foam (expansion ratio 300:1) under standardized conditions.
One of the main conclusions was that the Anoxia Method is fundamentally different from low expansion fire fighting foam. Physiological observations and postmortem examination showed that the mode of action of the Anoxia Method is anoxia, not occlusion of the airway.
The most important conclusion however is that the trials provide proof – of – principle for the Anoxia Method (submersion in gas-filled, high expansion foam).
McKeegan et al concluded: The Anoxia Method provides a rapid and highly effective method of euthanasia, which may have potential to provide humane emergency killing or routine depopulation.