One hundred and fifty pigs with an average body weight of 6.6 kg were allotted to treatment in a completely randomized block design. The treatments included: 1. Control (basal diet), 2. P-glycan (basal diet + 40 ppm peptidoglycan), 3. MOS (basal diet + 0.1% mannanoligosaccharides), 4. MG (basal diet + 0.4% (3-glucan) and 5. NIS (basal diet + 300 ppm Nonspecific Immunostimulating Anionic Alkali Solution, rice bran was used as a carrier). Each treatment had 6 replicates with 5 pigs per replicate. Overall, although there were no significant differences in animal performance, pigs fed MOS showed better growth performance and feed efficiency than the other groups. Nutrients and amino acid digestibilities were improved during phase II (d 15 to 28 post-weaning) compared to phase