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《Chinese Journal of Animal Nutrition》 2014-06
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Effects of Combined Exposure to Lead and Cadmium on Performance,Egg Quality and Egg Trace Elements Content of Laying Hens

CHEN Dawei;GAO Yushi;TANG Xiujun;LU Junxian;JIA Xiaoxu;GE Qinglian;PU Junhua;Jiangsu Institute of Poultry Sciences,Laboratory of Quality and Safety Risk Assessment for Poultry Products Ministry of Agriculture (Yangzhou);  
This experiment was conducted to study the effects of combined exposure lead(Pb) and cadmium(Cd) on performance,egg quality and egg trace elements content in of laying hens.A total of 120 forty-weekold Hy-line brown hens with the same body weight were randomly allocated to 4 groups with 3 replicates per group and 10 hens per replicate.Hens in the control group drank purified water,and hens in the experiment groups drank water supplemented with 100 mg/L Pb,50 mg/L Cd and 100 mg/L Pb+50 mg/L Cd,respectively.The experiment lasted for 8 weeks.The results showed as follows:1) compared with the control group,there were no significant differences in average daily feed intake,average egg weight and the ratio of feed to egg in groups Pb,Cd and Pb+Cd(P0.05);the laying rate in groups Cd,Pb and Pb+Cd was decreased by14.73%(P0.01),6.21%(P0.05) and 27.50%(P0.01) at the eighth week.2) Compared with the control group,there were no significant differences in eggshell color,index of egg shape,eggshell thickness and strength in groups Pb,Cd and Pb+Cd(P0.05);the haugh unit and yolk color in groups Pb and Cd were significantly decreased at different times(P0.05 or P0.01).3) The contents of Zn,Cu,Mn,Fe and Se in groups Pb and Cd were significantly lower than those in control group(P0.05 or P0.01),and the decrease rate in group Pb+Cd was significantly higher than that in groups Pb and Cd(P0.05 or P0.01).The contents of Pb and Cd in eggs gradually increased with exposure time.The eggs Cd content in group Cd was14.920 μg/kg,the eggs Pb content in group Pb was 97.815 μg/kg,and the eggs Cd and Pb contents in group Pb+Cd were 7.007 and 146.576 μg/kg at the eighth week,respectively.In conclusion,sub-chronic exposure to Cd and/or Pb decrease the laying rate and egg quality,and reduce haugh unit,yolk color and the contents of Mn,Fe,Cu,Zn and Se in eggs.Combined exposure to Pb and Cd has superimposed effect(synergistic effect) on performance and egg quality of laying hens.
【Fund】: 江苏省家禽科学研究所博士基金项目(JQ201201)
【CateGory Index】: S831.5
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