Studies conducted by the University of Manitoba show biofiltration can reduce swine barn emissions of hydrogen sulfide, one of the major odor causing gases, by about 80%. The University, in partnership with the Manitoba Livestock Manure Management Initiative, has unveiled a new odour reducing biofilter technology. The technology uses a combination of woodchips and compost to harbor a natural population of microorganisms, which use the odorous molecules as a food source. Evaluations are still forthcoming but they appear to be effective at reducing hydrogen sulfide, which would typically suggest similar types of reductions would be obtained on the other odour causing compounds.