| The GIFT Oreochromis niloticus with an initial weight of 2.43(±0.03)g, were randomly assigned to 5 groups and
respectively fed the diets supplemented with different levels of Lactobacillus(0, 8*10^5, 4*10^6, 2*10^7 and 1.5*10^8 CFU/g, diet), named G0,G1, G2, G3 and G4. After 42 days’feeding, the results showed that no significant difference was found in WGR, SGR, PER and FC of fish among all groups. There was no significant difference in body moisture and ash content. Crude protein and crude lipid content in G1~G4 increased compared with G0. Serum SOD, AKP and ACP activities in G1~G4 were higher than in G0, showing a significant increase in G3. Dietary Lactobacillus decreased the total bacteria count in the intestine which were significantly lower in G2 and G3 than in G0.The number of intestinal Escherchia coli in G2~G4 was significantly lower than in G0. The number of intestinal Lactobacillus and Bifidobacterium was not significantly different among all groups. In conclusion, dietary Lactobacillus could improve the growth performance to some extent and non-specific immunity, reduce total number of bacteria and E. coli in the intestine of GIFT O. niloticus. |
