Livestock Housing System

Technology	Livestock Category	Environmental Impact	Documentation	Remarks
Cooling of manure (flush tube barns)	Pigs	Ammonia: Up to 30 %. The reduction is calculated on the basis of the formula: 0,85x-0,004x2 (x=W/m2) Odour: Up to 20 %. The reduction is calculated on the basis of the formula: 0,77x	MELT Expert Recommendation	Admitted to List of Environmental Technologies in 2018.
Cooling of manure (wire-type barn cleaner)	Pigs	Ammonia: Up to 34 %. The reduction is calculated on the basis of the formula: 1,66x-0,02x²) No reduction of odour emissions	MELT Expert Recommendation	Admitted to List of Environmental Technologies in 2018.
JH Acidification NH4+	Pigs	64% reduction of ammonia emissions No reduction of odour emissions	MELT Expert Recommendation VERA Verification Statement for JH Forsuring NH4+	Admitted to List of Environmental Technologies in 2012. Revised in 2014. This technique can on special terms substitute natural surface crust.
JH Smellfighter In combination with JH Acidification	Pigs	51 % odour reduction Same reduction of ammonia emissions as JH acidification in pig barns	MELT Expert recommandation	Admitted to List of Environmental Technologies in 2018.
JH Acidification NH4+	Cattle	50% reduction of ammonia emissions No reduction of odour emissions	Documentation of the technology by the Danish Environmental Protection Agency	Temporarily admitted to List of Environmental Technologies by special agreement with the Danish Environmental Protection Agency. This technique can on special terms substitute natural surface crust.
Daily removal of slurry in mink cages	Mink	27% reduction of ammonia emissions No reduction of odour emissions	MELT Expert Recommendation VERA Verification Statement for daily removal of slurry in livestock housing systems for minks	Admitted to List of Environmental Technologies in 2013. Remarks on daily removal of slurry
Removal of slurry in mink cages twice a week	Mink	27% reduction of ammonia emissions No reduction of odour emissions	MELT Expert Recommendation VERA Verification Statement for removal of slurry twice a week in livestock housing systems for minks	Admitted to List of Environmental Technologies in 2013. Remarks on removal of slurry at frequent intervals
Removal of slurry in livestock housing systems for fattening pigs weekly (flush tube barns)	Fattening pigs i	No reduction of ammonia emissions 20% reduction of odour emissions	MELT Expert Recommendation	Admitted to List of Environmental Technologies in 2015.
Manure belt for laying hens in cages	Laying hens	30-36% ammonia reduction at respectively two and three weekly removals of manure. No reduction of odour emissions	Documentation of the technology by the Danish Environmental Protection Agency	Temporarily admitted to List of Environmental Technologies by special agreement with the Danish Environmental Protection Agency.
Manure belt for laying hens in barns	Laying hens	54-66% ammonia reduction at respectively two and three weekly removals of manure. No reduction of odour emissions	Documentation of the technology by the Danish Environmental Protection Agency	Temporarily admitted to List of Environmental Technologies by special agreement with the Danish Environmental Protection Agency.
Point exhaust ventilation in livestock housing systems for fattening pigs	Pigs	Reduction of ammonia emissions depend on the efficiency of the air cleaner attached. The reduction is calculated on the basis of the formula: Overall effect = 0.7 × E – 12 Reduction of odour emissions depend on the efficiency of the air cleaner attached. The reduction is calculated on the basis of the formula: Overall effect = 0.39 × E + 9	MELT Expert Recommendation	Admitted to List of Environmental Technologies in 2014.
Rokkedahl Energi Heatexchanger for Poultry houses	Poultry	30 % ammonia reduction No reduction of odour emissions	MELT Expert Recommendation	Admitted to List of Environmental Technologies in 2016.