Observations
Pigs were allowed to adapt to their new environment, the feed offered and to using the feeders for two weeks. The Table 1. Chemical and physical properties of control and fibrous.
period would also allow them to establish ranks so that the effect of diet on aggressive behaviour could be clearly defined. Each pig was weighed at the beginning of the experiment and, thereafter, weekly.
Injuries emanating from aggression behaviours were assessed on individual pigs in each group. This was done at the beginning of the experiment and, thereafter, weekly on fresh lesions when the pigs were being weighed. To facilitate counting, the body was divided into three regions: head, neck and shoulder region, and the remaining parts of the body. Recordings were done only on fresh lesions, which were judged subjectively by colour and the estimated age of scabbing (Turner et al., 2006).The scoring method used followed that of Stukenborg et al. (2012). To keep the scores consistent throughout the experiment, one person assessed the injury scores.
Behavioural activities of pigs in each pen were recorded continuously using video cameras mounted on the ceiling for eight hours, starting at 0800 h and ending at 1600 h. All pigs were numbered on the back with paint, which aided in the accurate identification during observation. Behavioural activities observed in the study are shown in Table 2. Time spent on different behavioural activities was observed for a period of three weeks, once a week. The behavioural activities were scored by the same person during the study period. For determining number of fights made by pigs in each group, a fight was recorded when it took longer than 2 s and a new fight started if there was an intervening period of more than 8s (Puppe, 1998).