3.1 Production animalsPigs, poultry

3.1 Production animals
Pigs, poultry, cattle, goats and to a far lesser
extend sheep are kept in indoor facilities for a
variable part of their life, often for all of th
eir life. For dairy cattle, goats and sheep these
facilities are quite open and air quality is to
a certain degree comparable with the outdoor
air quality. The quality of this air is still much better than that of the closed facilities for
swine and poultry (Wathes et al., 1998). These bu
ildings are rather clos
ed and the natural or
mechanically ventilation is via small air inlets
and outlets. Indoor temperature is regulated