Vehicle for transporting animals

A truck trailer for transporting animals, in particular cattle for breeding and/or slaughter, the truck trailer (1) being provided with a load space (2), the load space (2) being provided with substantially closed front (4), rear (5), lower (6), upper (7) and side walls (8), the truck trailer (1) being provided with an air supply and discharge system (3) arranged to maintain in the load space (2) air conditions for the purpose of keeping alive the animals to be transported. The invention also relates to a truck, and to a use of a truck trailer.