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and others showing they did not. However, the current scientific consensus is that the "inhalation of high concentration of carbon dioxide is aversive and can be distressing to animals." Nitrogen has been used to induce unconsciousness, often in conjunction with CO₂. Domestic turkeys are averse to high concentrations of CO₂ (72% CO₂ in air) but not low concentrations (a mixture of 30% CO₂ and 60% argon in air with 3% residual

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