The minimum ventilation requirement is 0,7 m³/kg
bodyweight and the maximum ventilation requirement
is 3,6m³/kg bodyweight.
During the coldest winter period, it is sometimes useful
to heat the house after 6 weeks of age to maintain a
good environment in the rearing building, otherwise the
problems mentioned above can occur. Cyclic ventilation
could be a way to ensure a minimum ventilation rate.