The study was conducted as a randomised complete block design with 65 pens in three groups filled two weeks apart.The rooms were ventilated using negative pressure and were maintained within the thermo-neutral zone for the pigs, witha 12-h light (0600–1800 h), 12-h dark cycle. Pens of pigs within block representing areas within the room were randomlyallocated to be fed one of the five experimental diets during the 5-week study, starting 7 days post weaning for a total of 13pen-replicates per diet. Pens (1.1 × 1.5 m) were equipped with a 4-feeding spaces self-feeder, a nipple drinker and plasticslatted flooring. Pigs had free access to feed and water.