Fuente: WIPO "meat" A method for stunning pigs using gas, the method comprising the steps of: a) preparing the pigs to the gas-stunning procedure of the pigs; b) gas stunning the pigs in a gas-stunning chamber, after step a); wherein step a) comprises the steps of: a1) providing pigs in crates in which at least two pigs are present in each crate; a2) keeping the pigs in the crates in a relaxation chamber, wherein each crate containing pigs remains in the relaxation chamber for at least 30 minutes; a3) conveying the crates from the relaxation chamber to a conditioning chamber, in which conditioning chamber the 02 vol % is lower than 13% and higher than 6%; a4) keeping the pigs in the crates in the conditioning chamber, wherein each crate containing pigs stays in the conditioning chamber for at least 3 minutes; a5) conveying the crates from the conditioning chamber to the gas-stunning chamber.