A method of performing a procedure on an animal using a foam, said foam having a gas composition suitable for performing the procedure; wherein the procedure is performed using a confined space; and
wherein
- foam is introduced in a confined space, and
- the animal is covered with the foam.
is performed;
To produce foam which reduces the risk of asphyxiation, the foam generator (100) used for generating the foam comprises
- as the screen a bubble-forming plate (120) comprising a multitude of through-holes (121), and
- the outlet (141) for the aqueous detergent composition comprising a full cone (120) spray nozzle (130) for directly spraying the aqueous detergent composition against the perforated bubble-forming plate (120);
wherein the step of generating the foam comprises spraying the aqueous detergent composition with a pressure drop over the nozzle (130) of less than 2 Bar directly against the perforated bubble-forming plate (120) at a rate Rd between 0.0003 - 0.0006 m 3 per m 2 of surface area of the perforated bubble-forming plate (120) per second.