VENTILATION PROVISION should be made for ventilation on sunny days in winter. The air which enters the open windows is usually sufficient for this purpose, but it should be directed up ward and especial care be taken that no drafts come on the pigs. From two to five hogs may be kept in each pen, 8x16 feet square, but for sanitary rea sons, no more than 50 should be main tained in one building.
Small yards should be attached to the pens in which the pigs can take ex ercise in pleasant weather. This is par ticularly desirable for breeding and stock hogs.