›› 2018, Vol. 45 ›› Issue (10): 2707-2715.doi: 10.16431/j.cnki.1671-7236.2018.10.007

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Effects of Zinc Sulfate on Immune Function and Egg Quality in Jinghong Laying Hens

ZHENG Aijuan1, CHEN Jiang1, BAI Jie1, CAI Huiyi1,2, CHEN Zhimin1, CHANG Wenhuan1, ZHANG Shu1, LIU Shijie2, LIU Guohua1   

  1. 1. The Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. National Engineering Research Center for Biological Feed Development, Beijing 100081, China
  • Received:2018-03-21 Online:2018-10-20 Published:2018-10-20

Abstract:

The aim of this study was to evaluate the effects of zinc sulfate on immune function and egg quality by adding different levels zinc sulfate into the basal diet of Jinghong laying hens.Five hundred forty 20-week-old healthy Jinghong laying hens were randomly allotted to six treatments,with 6 replicates per treatment and 15 layers per replicate.These birds were feed with six diets,the basal diet (control group,T1,Zn content was 25 mg/kg),and the diets added 25,50,75,100 and 125 mg/kg zinc sulfate (calculated by Zn) respectively on the basis of the basal diet (T2,T3,T4,T5 and T6 groups).The pre-feeding period was 2 weeks and the experimental period was 24 weeks.The rate of broken and crack egg was calculated every 4 weeks.At 33 weeks and 45 weeks of age,the egg quality,antioxident and immune parameters were observed.The results showed that:Compared to the control group,the supplementation of different levels zinc sulfate did not affect broken and crack egg,eggshell thickness and strength,egg albumin height,Haugh units and yolk color,the serum activities of ALP and LDH,the contents of IgM,IgA and Newcastle disease antibody titer,as well as immune organ weight,organ index and the avtivity of CuZn-SOD in the liver(P > 0.05),but increased the serum content of IgG at 33 weeks extremely significantly (P < 0.01).In conclusion,the recommended optimal addition amount was 75 mg/kg Zn from zinc sulfate in the diet.

Key words: zinc sulfate; Jinghong layer hens; egg and eggshell quality; immune function

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