Feature of three types of floor systems
Experimental treatments
(a) cross-section of the experimental building; (b) floor plan of the investigated rooms.
Pit ventilation system underneath the floor in one room (both rooms have the same layout).
Daily mean temperatures and ventilation rates during the pigs’ growing period:
Mean ventilation rates and outside temperature at the same hours of the measuring days:
Means ± standard deviations of temperature and relative humidity in room and pit air, and ventilation rate through room and pit exhausts
System C - room with diffusion ceiling / ceiling jet inlet.
System W - room with wall jet inlet.
2 m above the floor.
1.5 m above the floor.
Means ± standard deviations of ammonia concentrations at different locations and ammonia emissions through room and pit exhausts
for system C was in the attic and for system W was outside the wall jet inlet.
System C - room with diffusion ceiling / ceiling jet inlet.
System W - room with wall jet inlet.
Main effect calculated with the t-test statistical model.
Daily mean ammonia concentrations at different locations during the pigs’ growing period:
Mean ammonia concentrations at the same hours of the measuring days:
Daily Mean ammonia emissions from different exhausts the experiment days:
Mean ammonia emissions at the same hours of the measuring days:
Mean total ammonia emissions and mean total ventilation rates at the same hours of the measuring period:
Mean diurnal pattern of pig activity time (calculated as the percent difference from the daily mean number of pigs not lying) for ventilation systems C and W:
Slurry depth in different pits during the pigs’ growing period:
Ammonia concentration difference in pit exhaust air between system W and system C (system W - system C) (
Ammonia concentration difference in room exhaust air between system W and system C (system W - system C) (
Composition of the experimental diets
Relative prediction error of U
Relative prediction error of U
Emission rate, total mass in the pit headspace and retention time of NH