Effects Of Green Tea And Tea Polyphenols On Lipid Metabolism And Immuno-performances Of Lohmann Layers

In this investigation, a total of1620,18-week-old Lohmann laying hen was selected. The dasaldiets were reapectively supplemented with2,4,6,8g/kg green tea powder, and0.5,1.0,1.5,2.0g/kg tea catechins. The breeding lasted98days. Our aim is to investage the effects of green tea andtea catechins on lipid metabolism, antioxidation in serum, and immune performance of birds. Theresults are as followed:1. Effects of lipid metabolism: Compared with the control group after bred at week8. The totalcholesterol (TC) and the total triglycerides (TG) in chicken leg respectively decreased by6.01%(P<0.05) and34.39%(P<0.05) for6g/kg green tea group. TC and TG in breast respectivelydecreased by9.87%(P<0.05) for2g/kg tea catechins and20.72%(P<0.01) for1.5g/kg teacatechins. The TC and TG in egg respectively dereased by7.37%(P<0.05) and20.82%(P<0.01)for1.5g/kg tea catechins at week10. TG level in plasma decreased by48.20%(P<0.05) at week8,TC level in plasma reduced32.05%(P<0.05) at week10after ingested1.5g/kg tea catechins.High density lipoprotein cholesterol (HDL) level in plasma increased by67.74%(P<0.01) afteringested8g/kg green tea for8weeks. Very low density lipoprotein (VLDL) decreased by41.42%(P<0.05) for8g/kg green tea and48.18%(P<0.05) for1.5g/kg tea catechins at week8.2. Change in total fatty acid in fecal: Comparison with the control, except for2g/kg green teagroup, all treatments in which supplemented with green tea and tea catechins had higher theexcretion of fatty acid at week6. The excretion of fatty acid in feace respectively increased by1%for6g/kg green tea and0.8%for1g/kg tea catechins than that of control.3. Effects of antioxidation in serum: For6g/kg green tea group after bred at week8, the totalsuperoxide dismutase (T-SOD) activity and glutathione peroxidase (GSH-px) activity in birdserum were respectively20.31%, and8.72%higher than those of the control groups. Themalondialdehyde (MDA) level in serum reduced37.09%on compared with the control. For1.5g/kg tea catechins groups after bred at week10, the total superoxide dismutase (T-SOD) activityand glutathione peroxidase (GSH-px) activity in bird serum were respectively18.48%, and5.76%higher than those of the control groups. The malondialdehyde (MDA) level in serum decreased by19.60%on compared with the control.4. Effects of immune performance: Comparison with the control group, the total protein, albumin,globulin, immunoglobulin G, immune globulin A levels in plasma respectively increased by 4.72%、7.31%、5.88%、10.99%、1.96%after ingested6g/kg green tea supplemented with the dietfor10weeks. For2g/kg tea catechins groups after bred at week10, the total protein, albumin,globulin, immunoglobulin G, immune globulin A levels in plasma respectively increased by3.20%、7.24%、8.82%、20.88%、1.96%The immuno-indices had no significant differencebetween bred at week12and bred at week10. The overall results indicated that the immuneperforemence was better when ingested6g/kg green tea, or2g/kg tea catechins for10weeks.