Introduction
Postweaning piglets suffer several stress factors including nutritional, environmental and social status. Gut imbalance frequently occurred in postweaning piglets due the in- creased population of Enterobacteriaceae (ENT) and decreased population of lactic acid bacteria (LAB) (Loh et al. 2002; Taras et al. 2006). Therefore, diarrhoea incidence is usually encountered in piglets immediately after weaning which is associated with a reduction in voluntary feed intake, poor growth rate, intestinal villus atrophy and overall gut malfunction.