EXAMINATION OF FEED-ADDITIVES AND SLURRY- ADDITIVES FOR DECREASE OF AMMONIA EMISSIONS FROM PIG KEEPING

Ammonia emissions from animal farming have negative effects inside and outside of animal housings. Numerous feed or slurry additives are off ered to reduce the ammonia emissions from pig keeping. investigations were carried out to test the effectiveness of a clinoptilolite-contain ing feed additive named ''Klinofeed'' on practical farms and in labora tory experiments. Some effects of ammonium retention were seen in the laboratory tests, which also revealed informations on the absorption m echanisms of ammonium ions. The field experiments didn't show any ammo nia reducing effect of the additive. It is recommended to develop a st andardized procedure of testing the effectivity and usefulness of feed acid slurry additives which are manufactured and sold for ammonia red uction purposes. The presented experiment could be a first basis for s uch a test procedure.