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|Título:||Ammonia and greenhouse gas emissions from slatted and solid floors in dairy cattle houses: A scale model study|
|Citação:||Pereira J., Fangueiro D., Misselbrook T.H., Chadwick D.R., Coutinho J., Trindade H., 2011. Ammonia and greenhouse gas emissions from slatted and solid floors in dairy cattle houses: A scale model study. Biosystems Engineering 109, 148-157.|
|Resumo:||Dairy cattle are usually housed in naturally ventilated houses where removal of excreta is periodically performed. The aim of this controlled study was to compare the effect of two ﬂoor designs and three air temperatures (5, 15 and 25 C) on NH3, N2O, CH4 and CO2 emissions arising from cattle excreta deposition to the ﬂoor. Two scale models were built to simulate a level solid ﬂoor without urine drainage, and a slatted concrete ﬂoor. Following application of a mixture of urine and faeces, these two ﬂoor type models were subjected to a constant airﬂow rate (12.5 exchanges h 1 ) and gaseous emissions were measured over a 72-h period. Emissions of NH3, N2O, CO2 and CH4 increased signiﬁcantly with air temperature with both ﬂoor type models and emissions of NH3, N2O and CO2 were signiﬁcantly greater from the solid ﬂoor relative to the slatted ﬂoor at all temperatures considered. The cumulative NH3 (27e66% of total N applied) and CO2 (<19% of total C applied) emissions were greater from the solid ﬂoor than from the slatted ﬂoor (by 36% and 44%, respectively). The cumulative N2O (<0.1% of total N applied) and CH4 (<0.4% of total C applied) emissions were relatively low and CH4 values did not differ signiﬁcantly between treatments. Cumulative greenhouse gas emissions (as CO2-equivalents) increased signiﬁcantly with temperature but did not differ between the ﬂoor types.|
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