In the International Journal of Pharmacology, a group of Mexican scientists discuss the controversies related to stunning pigs and poultry with of high concentrations of Co2.

One of the recommendations was: ‘From the perspective of animal welfare, 90% argon by volume, or the lowest possible Co2 concentration to stun a swine is recommended. Argon is suggested as welfare-friendly alternative to carbon dioxide for stunning/killing pigs and poultry’.

During this research, 90% Argon in volume in combination with Co2 was reviewed: a combination of gasses resulting to the same as using Nitrogen foam, filled with 98% nitrogen: Anoxia, the total absence of oxygen. Is it fair to suggest that Anoxic Nitrogen Foam would be a reasonable alternative for using high concentrations of Co2?

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