The floor in finisher housing can be designed with non-slip concrete flooring with a greater or lesser degree of opening. It is possible to provide a part of the floor with slats, which can be combined with drained flooring and/ or solid flooring. A solid floor in the building reduces the amount of ammonia evaporation and therefore results in higher welfare for the pigs. When the pigs have the opportunity to divide the pen with a resting area and a dunging area, the dung deposition on the slatted floor is ensured. For that reason, the slatted floor must be big enough for grown finishers not to dung on the solid floor.