INFLUENCE OF LIGUSTRUM LUCIDUM,SCHISANDRA CHINENSIS,SI JUN ZI TANG AND DAIDZEIN ON ANTIOXIDANT STATUS OF LAYING HENS UNDER HEAT STRESS

Ninety-six 59-weeks old laying hens were used to investigate effects of chinese medical herbs(CMHS) on antioxidant status of laying hens under heat str ess.Experiment birds were divided into 6 groups.Group 1,2,3 were fed a basal die t supplemented with 1% Ligustrum Lucidum(LL),Schisandra Chinensis(SC),and Si Jun Zi Tang(SJZT),respectively.Group 4 were fed the basal diet supplemented with 10 mg/kg Daidzein(DA).Group 5 were fed the basal diet supplemented with 5mg/kg flav omycin.Group 6 were fed the basal diet.The experiment lasted 4 weeks.The environ ment temperature was (32.0±0.5)℃.Results shown that supplemental LL,SC,SJZT an d DA significantly increased productive performance of hens.LL,SC,SJZT and DA re duced lipid peroxides(LPO) content in tissues or yolks,significantly(P0.05).Lit tle differences were found on superoxide dismutased(SOD) activity(P0.05).There was significant improvement of glutathione reductase(GR) activity(P0.05) by sup plemented with LL,SC,SJZT or DA.Little difference was observed on GSH contents i n heart,liver or serum(P0.05).No effect of layer lipids stability was found by supplemented with flavomycin.In conclusion,LL,SC,SJZT and DA could improve heat stressed layers lipids stability by increasing GR activity in tissues or serum.