The experiments were done in a laboratory. It must be reminded that the figures given consider only the ammonia emission reduction from the manure pit which represents only a source of emission in the building (wet or soiled floor or slats are also ammonia sources). More work as to be done on real scale to determine the best type of liquid to be used on economical and environmental points of view and also the best manure removal techniques that would retain the top liquid layer in the pit.