Abstract:

To study the effects of konjac mannose-oligosaccharides in diet on th immunity function and mecum microflora of three-yellow broilers and the possibilitity of substitutes for antibiotics, two hundred sixteen one-day three-yellow broilers are divided randomly into 6 treatments with three replicates. There are twelve broilers per replicate with feed and water provided ad libitum. The basic diet of the six groups is the same and treatments are as follows :control (no MOS and no lincomycin), 600 mg/kg lincomycin, 1 g/kg MOS, 2 g/ kg MOS, 4 g/ kg MOS and 8 g/kg MOS. The results show: (1) 4 g/kg MOS level of the diet significantly improves the index of thymus (P<0.05), and has a tendency of increasing the index of spleen and bursa but not significantly(P>0.05); (2) 600 mg/kg lincomycin and 4 g/kg MOS of the diet both increase serum lysozyme level significantly(P<0.05), however 8 g/kg MOS of the diet has the higher serum antibody titres to New castle disease virus than the control group and lincomycin group(P<0.05); (3) Compared to the control group, MOS significantly increases the concentration of lactobacillus and decreases the number of salmonellae(P<0.05), in addition the number of E. coli has a higher tendency but not significantly(P>0.05); (4) MOS can substitute for the lincomycin in the three-yellow broilers feeding.