Maize cobs were used as a fibre source in the experiment. It has a low water holding capacity which does not depress feed intake greatly at 160 g/kg. The inclusion level of maize cobs at 160 g/kg in a diet corresponds to 138 g/kg optimum level of acid detergent fibre (ADF), which does not constrain gut capacity in pigs (Ndou et al., 2013). The objective of the study was, therefore, to determine the effect of feeding the fibrous diet on growth performance and aggressive behaviours of grouped growing pigs. It was hypothesized that the fibrous diet does not affect growth performance and it also reduces aggressive interactions.