The daily weight gain was not affected by the dietary treatment in any of the three periods considered (P≥0.48) (Table 2). The daily feed intake during the first two weeks post-weaning was also very similar in the three dietary groups (P=0.57). During the last four weeks of the study and when the whole period was considered, a tendency to lower feed intake with increasing dietary acetic acid was observed P≤0.09). The gain/feed ratio was not affected by diet during any of the periods considered (P≥0.41).