Abstract

Gas mixtures, especially high concentrations of carbon dioxide, are widely used in Europe to stun or kill pigs and poultry, and to a limited extent some species of farmed fish. Mixtures of argon and nitrogen are used mainly to stun or kill poultry species. Research has shown that animals exhibit aversive reactions during exposure to high concentrations of carbon dioxide and very little or no aversion to atmosphere containing mixtures of argon, nitrogen, and low concentrations of carbon dioxide. The relative animal welfare merits of gas mixtures are presented.

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