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1. WO2020115116 - PROCÉDÉ DE RÉDUCTION DU NIVEAU DE STRESS CHEZ LES ANIMAUX

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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CLAIMS

1. A method of reducing stress level in animals such as pigs, the method comprising:

• sealable enclosing the animals in at least one chamber,

• exposing the animals to a gas mixture comprising oxygen and at least one type of physiologically inert gas,

• gradually decreasing the oxygen concentration from a maximum level, to a minimum level,

• gradually increasing the at least one physiologically inert gas concentration from a minimum level to a maximum level,

wherein the minimum level of the oxygen concentration is higher than the anesthetic causing concentration for the animals.

2. The method according to claim 1, wherein the maximum level of oxygen is between 17 to

25 %, preferably between 19 to 23%, preferably around 21%.

3. The method according to claim 1 or 2, wherein the minimum level of oxygen is between 3 to 10 %, preferably between 4 to 8%, preferably around 6%.

4. The method according to any of the preceding claims, wherein the minimal concentration of the at least one physiologically inert gas concentration is between 75 to 83 %, preferably between 77 to 81 %, preferably around 79 %.

5. The method according to any of the preceding claims, wherein the maximal concentration of the at least one physiologically inert gas concentration is between 90 to 97%, preferably between 92 to 96%, preferably around 94%.

6. The method according to claim 1 or 2, wherein the initial exposed gas mixture is

atmospheric air.

7. The method according to any of the preceding claims, wherein the at least one

physiologically inert gas comprises N2 gas and/or Ar.

8. The method according to any of the preceding claims, wherein the gas mixture comprises

CO2 and where the concentration of the CO2 is in the range from 0.1% up to a maximum concentration level, where the maximum concentration level is lower than the anesthetic causing concentration for the animals.

9. The method according to claim 8, wherein the maximum CO2 concentration level is lower than 21%.

10. The method according to any of the preceding claims, wherein exposing the animals to the gas mixture is while the animals are standstill.

11. The method according to any of the preceding claims, wherein the at least one chamber extends from a first position where the animals are received to a second position where at least one subsequent process takes place, where the exposure to the gas is while the animals move from the first position towards the second position, the first position being the position where the concentration of the oxygen is maximum and where the

concentration of the at least one physiologically inert gas is minimum, the second position being the position where the concentration of the oxygen is minimum and the

concentration of the at least one physiologically inert gas is maximum.