Abstract: The trial was conducted to study the effects of astragalus polysaccharides (APS),compound polysaccharide(CPS),yeast culture ( YC ),nucleic acid(NA) and transfer factor(TF) on performance and immune function of pullets in the immune program in scaled and intensive poultry system. Two hundred and forty pullets(Hyline Brow) 11 week old were divided into 6 groups with 4 replicates in each group and 10 pullets per replicate. The average weight per replicate was similar. Pullets in group 1(Control group) were fed with corn}oybean based diet and the rest pullets in 5 groups (Group2) were fed with based diets supplied with APS,CPS,YC,NA and TF respectively. Blood samples were collected to detect the hemagglutination inhibition(HI) antibody titers against Newcastle disease virus(NDV) and H5 influenza virus(H5-4-AIV) in 7 play adaptation. Forty-eight pullets were selected and signed number to divide into 6 groups and make sure that antibody titers against NDV and HS4}1IV per replicate was similar. The results showed that:After 6 weeks, no significant difference ( P>0.05)in performance parameters such as total feed intake (TFI),body weight gain (BWG),and feed/gain(F/G) was observed among the six groups. Nonspecific immunity (Activity of lysozyme),humoral immunity(Antibody titers against NDV and H5-AIV,IgG concentration) and cellular immunity (T lymphocyte transformation rates) also did not differ significantly (P>0.05 ) among groups. The present data suggested that APS,CPS,YC,NA and TF had no positive effects on performance and immune function of pullets in the immune program in scaled and intensive poultry system, and there were no difference among five immune synergists.

Key words: Immune synergist, Pullet, Performance, Immune function

CLC Number: 

• S831