Heber et al. (1998) measured odor emission rates from
four mechanically ventilated swine finishing houses between
April and August. The buildings had long-term manure
storage beneath fully slatted floors. The mean odor concentration
of 109 measurements was 142 OU/m3, and the
odor emission rate was 5.0 OU m−2 s−1. Odor emission rates
were measured from two nursery rooms in Indiana from
March to May (Lim et al., 2001). The rooms were
mechanically ventilated with long-term manure storage pits
under wire floors. The mean odor concentration was
199 OU/m3. The mean net odor emission rate from the two
nursery rooms was 34 OU AU−1 s−1, or 1.8 OU m−2 s−1. These
results were lower than the results obtained by the current
study. The difference between the odor concentrations and
emission rates obtained in the cold Canadian Prairies in the
current study and the results obtained by Heber et al. (1998)
and Lim et al. (2001) may be mainly due to the climate
differences and other factors such as differences between
building systems, manure management, and odor measurement
methods in the field and olfactometry laboratories.