Water and a commercial diet (corn, barley, wheat, soybean) were available ad libitum. At birth, piglets were individually marked with a unique numbered ear tag, assuring total traceability from birth to slaughter. Male piglets were castrated one week after birth, in accordance to current legislation (Belgian law 14 August 1986). At four weeks of age, pigs were weaned and group housed, making weight groups according to average body weight. The number of pigs ranged between 12 and 15 per pen depending on the availability of pigs per batch. Barrows and gilts were mixed per pen in a fixed ratio. The number of pigs per pen complied with European legislation (EU 2008/120/EC). Flooring was slats without bedding, i.e. plastic for weaners and concrete afterwards.