Effect of tea polyphenols on production performance,egg quality and hepatic antioxidant status of laying hens in vanadium containing diets
This study was conducted to determine the effect of tea polyphenols(TP)on production performance,egg quality and hepatic-antioxidant status of laying hens in vanadium containing diets.A total of 300 Lohman laying hens(67-wk-old)were used in a 1 plus 3×3 experiment design that hens were given either a diet without vanadium and TP supplementation(control)or diets supplemented with 5,10,15 mg V/kg and TP(0,600,1000 mg/kg)diets for 8 wks which included two phases,5 wks accumulation phase and 3 wks depletion phase.During accumulation phase,dietary vanadium addition decreased(linear,P < 0.01)albumen height and Haugh unit(HU),and TP supplementation mitigated(linear effect,P < 0.01)this reduction effect induced by vanadium.Eggshell thickness(linear,P < 0.01),redness(linear and quadratic,P < 0.05)and yellowness(linear and quadratic,P < 0.05)were decreased by vanadium and increased by effect of TP when vanadium-containing diet was fed.In depletion phase,the bleaching effect on eggshell induced by vanadium disappeared 1-wk after vanadium withdrawal.Eggshell thickness,eggshell strength,albumen height,HU were lower(P < 0.05)in 15 mg/kg vanadium groups compared with control diet until 2-wk post vanadium challenge,but hens fed 15 mg/kg vanadium and 600 mg/kg TP groups shown no difference with control diet only after 1-wk withdrawal.In liver,the activity of glutathione S-transferases was decreased(linear,P < 0.01)and glutathione peroxidase was increased(linear,P < 0.01)with the TP addition at 5 wk in accumulation phase in vanadium-containing diet,the malondialdehyde contents has increased(linear effect,P = 0.02)with the addition of vanadium.The results indicate that supplementation of 10,15 mg/kg vanadium resulted in reduced albumen quality,bleaching effect on eggshell color and antioxidant stress in liver.The effect of TP addition can prevent laying hens from the adverse effect of vanadium on egg quality and shorten the recovery time.
vanadium tea polyphenols egg quality depletion laying hens
Z.H.Yuan K.Y.Zhang X.M.Ding Y.H.Luo S.P.Bai Q.F.Zeng J.P.Wang
Institute of Animal Nutrition,Sichuan Agricultural University,Kechuang Feed Industry in Sichuan,Chengdu,Sichuan,China,611130
国内会议
重庆
英文
2174-2192
2016-05-25（万方平台首次上网日期，不代表论文的发表时间）