What is the recommended concentration of carbon monoxide used for euthanasia of small mammals?

The recommended concentration of carbon monoxide for the euthanasia of small mammals falls within the range of 4-6%. This concentration is considered effective in inducing unconsciousness and ensuring a humane death, as carbon monoxide binds to hemoglobin in the blood, leading to hypoxia without causing pain or distress during the process.

Using this concentration aligns with guidelines established by various organizations and regulatory bodies, which prioritize the welfare of the animals. It ensures that the procedure meets ethical standards for humane treatment while being efficient in achieving the desired outcome. Lower concentrations may not be effective enough to guarantee a rapid and humane death, while higher concentrations can lead to unnecessary suffering or distress as the animal may experience anxiety before loss of consciousness occurs.

In sum, 4-6% is recognized as an optimal balance for ensuring both efficacy and humane treatment in the euthanasia of small mammals.