Husbandry
Thirty-six pigs [(Landrace × Large White) sires × (Duroc × Large White) dams], weaned at approximately 23 ± 3 d of age and weighing 7.4 ± 1.2 kg, were obtained from a commercial farm. On arrival at the research station, the pigs were weighed, placed in individual flat-deck pens (1 × 1 m), and provided with an individual feeder and a nipple drinker. Room temperature was maintained at 31 ± 1°C for the first week of the trial, and then the temperature was reduced by approximately 2°C per week until reaching 26°C. The pigs had free access to water throughout the trial.