Table 2 lists the annual geometric means of odor
concentration and emission rate for each room and the
statistical analysis results for comparison of the rooms within
each type of barns. The temperature and total animals in a
room in terms of animal unit (1 animal unit = 500 kg of live
mass of animals) are also given. The results indicate that the
two gestation rooms were significantly different in odor
concentrations and emissions (P < 0.05). The standard
deviations were also noted to be very large, which reflected the high variations of odor concentrations and emissions
throughout the year. Table 3 lists the geometric means of the
rooms in each type of barn on different measurement dates
and the statistical comparison of the measurements taken
throughout the year. It indicates that the odor concentrations
and emissions of the gestation rooms were significantly
different throughout the year (P < 0.05). Odor concentration
generally increased with decreasing ambient temperature,
but the changes in the odor emission rate seemed not to be
related to ambient temperature. The correlations of odor
concentration and emission with ambient temperature and
other related factors are discussed later.