Weaned piglets were housed in two identical environmentally controlled rooms with slattedplastic floor and equipped with 24 pens (2.16 × 2.80 m). At the end of the starter period pigs were moved into the fatteningunit with partially slatted concrete floor pens (3.0 × 3.2 m). All pens were equipped with a self-feeder and a nipple drinkerto allow ad libitum access to feed and water.