A linear relationship between the odor concentration and
the three related factors takes the following form:
OC = a +bto +cti +dAU (1)
where
OC = odor concentration (OU/m3)
to = ambient temperature (°C)
ti = room temperature (°C)
AU = animal unit of the room (1 AU = 500 kg of pig
weight)
a, b, c, d = constants generated from the measured data
using PROC REG (SAS, 1999), listed in
table 4.
As indicated in table 4, odor concentration was inversely
related to ambient temperature for all four barns. The lower
the ambient temperature was, the higher the odor concentration
would be due to the reduced ventilation rate. The odor
concentration was positively linearly related to room temperature,
except in the nursery barn. The effect of animal units
on odor concentration was not conclusive for the four barns.