Effect Of Tea Polyphenols On Lipometabolism And Immunity Function Of Broiler Chickens

The experiments were conducted to study the effect of tea polyphenols on growth performance, lipometabolism, deposition of lipid and immunity function of broiler chickens. 420 1-day-old Avian broiler chickens, with random body weight, raised respectively according to sex, were randomly allotted into five treatments with 3 replicates in each treatment, 14 male broiler chickens and 14 female ones each replicate, for a two-phase trial(0-3w,4-6w). The experiment involved 5 dietary levels of tea polyphenols(contro1:0mg/kg;Treatl:10mg/kg;Treat2:20 mg/kg; Treat3:40 mg/kg;Treat4: 80 mg/kg). On the last day of every phase, 12 broiler chickens from each treatment were taken out randomly, stripped heart then slaughtered, blood samples were collected to determine physiological biochemical parameters, immunity indexes, lipid deposition and slaughter performance. The results showed as follows:Experiment 1. The growth performance: Throughout the whole experiment, there was no significant difference in ADG(male)among treat 4 and control group; Compared with control, there was no significant difference in ADG (female) , but there was significant difference among different treatment(p<0.05), treatl and treat4 have significant difference(p<0.05). The result showed that it couldn't decrease growth performance of broiler chickens when under 80mg/kg tea polyphenols are added into dietary.Experiment 2. The slaughter performance: There was no significant difference in slaughter performance.Experiment 3. Lipometabolism: There was different effect on male and female chickens' lipometabolism. For male chickens, TC, TG, LDL-C, PAF, PLF, IMF and SFP decreased significantly and HDL-C increased significantly by adding proper tea polyphenols (p<0.05). For female chickens, TC, LDL-C, PAF, PLF, and SFP decreased significantly by adding proper tea polyphenols (p<0.05), there was no difference for other indexes of female chickens.Experiment 4. Immunity function: There was different effect on male and female chickens' Immunity function. IgG of Serum, macrophage activity and Tlymphoblast transfermation rate of broiler chickens would significantly increase (p<0.05). Thymus index of male chickens and Fabricius bursa of female chickens would increase respectively (p<0.05). there was no difference for other indexes.