Abstract: An arrangement for keeping livestock, particularly pigs, in which the animals are kept individually or in groups in sleeping pens in such manner that they lie only adjacent to one another and predominantly only in one direction, but under certain circumstances also in opposed directions. The arrangement may provide air supply devices, air circulation devices and/or air discharge devices by which the air is processed according to the requirements of the animals. It is essential that on at least one side of the sleeping pen, an opening is provided through which the animal can at will move its head into a region outside the sleeping stall. The opening is provided with a simple or multiple curtain. The arrangement achieves the advantage that the warmer region surrounding the body of the animal is kept separate from the head and inhalation region and that the air conditions can be controlled separately in these regions.