Estrada et al. (2001) reported that dietary fructooligosaccharide supplementation negatively affected the growth performance of pigs weaned at 18 d of age. Dietary supplementation with 0.3 and 0.6% fructooligosaccharides did not affect ADG, ADFI, and feed efficiency in finishing pigs; however, pigs fed 0.6% fructooligosaccharides showed better growth performance than pigs
fed 0.3% fructooligosaccharides (Jin et al., 1999).