Pigs in each diet group had very similar feed intakes over the study duration and there were no significant differences
in weight gain between the groups: for pigs in the CTR group average feed intake was 6.02±0.52 kg per pen/day, for the
PRO group 5.95±0.70 kg per pen/day, for the PRE group 6.28±0.54 kg per pen/day and for the SYN group 6.04±0.67 kg per
pen/day.