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Advisor(s)
Abstract(s)
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.
Description
Keywords
solid floors cattle dairy cattle greenhouse gas
Citation
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.
Publisher
Elsevier