Environmental Conditions. Higher levels of temperature and humidity in the truck compartment
can endanger the animal’s breathing, and mortality can increase at temperatures
over 25ºC.(80) Transportation of pigs at over 28ºC favors stress development since the
heart and breathing rates are significantly quickened.(81) For this reason, the incidence of
PSE carcasses may easily double during the first hour of transportation in hot days.(82)
When vehicles are ventilated during transport, the excessive temperature and humidity in the
animal compartment can be reduced, improving transport conditions.(