The Effect Of Tea Polyphenols And Vitamin C On Antioxidant Function And Immune Function Of The Broilers

A 3×3mulitiple-factor experiment was conducted to study the interaction effect of different dietary Tea polyphenols and Vitamin C levels on the production performance, antioxidant function and immune function of broilers. Hence, two hundreds and eighty eight Avin broilers were randomly divided into 9 groups, each containing 4 replicates (8 birds per replicate). In the experiment Tea polyphenols supplement amounts were set to 30 and 60mg kg^-1, and Vitamin C supplement amounts were 100 and 200mg kg^-1 .The results are showed as follows:1. Considering the production performance, the growth rate was significantly improved and the feed conversion rate was significantly decreased by the individual effect of the supplements. However, there is no interaction effect between Tea polyphenols and Vitamin C in different growing stages (P>0.05).2. Considering the antioxidant function, there was significant improvement by the individual effect of the supplements. In addition, There was a significant interaction between Tea polyphenols and Vitamin C on improving the GSH-Px of the 21-day-old broilers (P< 0.01) . There was a significant interaction effect of Tea polyphenols and Vitamin C on improving the T-AOC of the 21-day-old and 42-day-old broilers (P < 0.05) . There was a extremely significant interaction between Tea polyphenols and Vitamin C on improving the SOD and decreasing the MDA of the 21-day-old and 42-day-old broilers (P < 0.05) .3. Considering the immune function, there was significant improvement by the individual effect of the supplements. Also, there was a significant interaction effect between Tea polyphenols and Vitamin C on improving the leucocyte swallow and spleen index of the 21-day-old broiler (P<0.05) . There was a significant interaction effect between Tea polyphenols and Vitamin C on improving the lymphocyte transformation and IL-2 of the 21-day-old and 42-day-old broiler (P < 0.05). There was a extremely significant interaction effect between Tea polyphenols and Vitamin C on improving the ignorant index (P < 0.05) and leucocyte swallow (P < 0.01) of the 42-day-old broiler.The above findings indicate that the two supplements had significant effect on improving the production performance, antioxidant function and immune function. The best addition level of Tea polyphenols was found at 60 mg kg^-1 and that of Vitamin C was 200mg kg^-1.