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Lead Contamination in Feed Affects Performance,Egg Quality and Antioxidant Capacity of Laying Hens

ZHU Sha1 ZHANG Aiting1 DAI La1 GU Linying2 ZHU Qiaoming2 ZOU Xiaoting1(1.Key Laboratory for Molecular Animal Nutrition of Ministry of Education,Feed Science Institute,Zhejiang University,Hangzhou 310058,China;2.Zhejiang Xinxin Feed Co.,Ltd.,Jiaxing 314005,China)  
This experiment was conducted to investigate the effects of lead contamination in feed on performance,egg quality and antioxidant indices in serum,liver and kidney of laying hens.Five hundred and seventy-six 40-week-old Hyline laying hens with the similar performance were randomly allocated to four groups(control group,T1 group,T2 group and T3 group),and every group had four replicates with 36 layers each.Lead was added to the basal diet at 0(control),15,30,and 60 mg/kg,respectively.The experiment lasted for 8 weeks.The results showed as follows: 1) there were no significant differences in laying rate and feed-egg ratio among all groups(P0.05);compared with the control group,the average egg weight in T3 group was significantly decreased(P0.05) and the average feed intake in groups T1,T2 and T3 was decreased by 3.72%(P0.05),1.93%(P0.05) and 3.63%(P0.05) from 1 to 8 weeks,respectively.2) Lead contamination in feed decreased albumen height and Haugh unit to some extent,but there were no significant differences in them compared with the control group except for albumen height in T3 group(P0.05).Eggshell strength and thickness in T3 group were both the lowest in all groups.Compared with the control group,eggshell strength in T3 group was declined by 21.89% and 16.84% at 4 and 8 weeks(P0.05).The variation trend of eggshell thickness was consistent with that of the eggshell strength,and both of them were decreased with the increase of dietary lead level,presenting a dose-effect relationship to some extent.3) Compared with the control group,glutathione peroxidase(GSH-Px) activity in serum,liver and kidney in experimental groups was significantly decreased(P0.05),and the malondialehyde(MDA) content was increased to some extent with the increase of dietary lead level.The MDA content in serum and liver in T3 group was significantly higher than that in the control group(P0.05).The MDA content in kidney in experimental groups was significantly higher than that in the control group(P0.05).There was a decreasing trend in glutathione(GSH) content and total antioxidant capacity(T-AOC),as well as superoxide dismutase(SOD) activity in serum,liver and kidney of laying hens.These results indicate that lead can reduce the egg quality,and induce the lipid peroxidation,furthermore,reduce the antioxidant capacity of laying hens.
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