In two blocks, a total of 192 pigs (Piétrain boar hybrid sow) were selected at 9 weeks of age (24 ± 3 kg) and allotted to 16 pens (3 2.4 m) with 50% concrete and 50% slatted floors. The experimental unit was a pen with six pigs (3 gilts, 3 barrows). Ambient temperature was 20 ± 2 C. Each pen was randomly assigned to one of four dietary treatments that were arranged factorially with two fibre concentrations and two grinding intensities, namely, (1) low fibre finely ground, (2) low fibre coarsely ground, (3) high fibre finely ground, and (4) high fibre coarsely ground. This resulted in eight pens per treatment. The pigs were slaughtered at an average pen weight between 105 and 110 kg.