Effects of Dietary Zinc Level on Growth Performance, Slaughter Performance, Serum Immune Indexes and Zinc Emissions of Broilers

CHEN Zhimin, LIU Guohua, CAI Huiyi, CHANG Wenhuan, ZHENG Aijuan, ZHANG Shu

doi:10.3969/j.issn.1006-267x.2018.09.019

2018 , Vol. 30 >Issue 9: 3494 - 3506

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.09.019

Molecular Nutrition

Effects of Dietary Zinc Level on Growth Performance, Slaughter Performance, Serum Immune Indexes and Zinc Emissions of Broilers

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National Research Center of Biological Feed, Key Laboratory of Feed Biotechnology of Agricultural Ministry, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2018-03-05

Online published: 2018-09-20

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Abstract

This experiment was conducted to investigate the effects of dietary zinc level on growth performance, slaughter performance, serum immune indexes and zinc emissions of broilers. A total of 600 healthy one-day-old Arbor Acres (AA) broilers were randomly allocated into 5 groups with 6 replicates per group and 20 broilers per replicate. Dietary zinc levels of all groups were 30 (basal diet group), 60, 90, 120 and 150 mg/kg, respectively. The experiment lasted for 42 days. The results showed as follows:1) during 1 to 42 days of age, the average daily gain of male broilers in 60, 90, 120 and 150 mg/kg zinc level groups was significantly higher than that in the basal diet group (P<0.05), but no significant difference was observed on the average daily gain of female broilers among all groups (P>0.05). 2) Dietary zinc level had no significant influence on immune organ index and slaughter performance of broilers at 21 and 42 days of age (P>0.05). 3) For male broilers at 21 days of age, the newcastle disease serum antibody titer in 120 and 150 mg/kg zinc level groups was significantly higher than that in the basal diet group and 60, 90 mg/kg zinc level groups (P<0.05), and at 21 days of age, no significant difference was observed in the newcastle disease serum antibody titer among all groups (P>0.05). For female broilers at 21 days of age, no significant difference was observed in the newcastle disease serum antibody titer among all groups (P>0.05), and at 42 days of age, the newcastle disease serum antibody titer in 120 mg/kg zinc level group was significantly higher than that in other groups (P<0.05). 4) Dietary zinc level had significant influence on the fecal zinc content and zinc apparent utilization rate of broilers at 21 and 42 days of age (P<0.05). At different growth stages, the fecal zinc content at 42 days of age was obviously higher than that at 21 days of age, the zinc apparent utilization rate at 21 days of age was obviously higher than that at 42 days of age. In conclusion, under this experimental condition, when dietary zinc level is 60 mg/kg, it can meet the needs of broiler growth; when dietary zinc level is 120 mg/kg, it can maintain the immune function of broilers.

Key words： zinc; broilers; growth performance; immune; zinc emissions

Cite this article

CHEN Zhimin, LIU Guohua, CAI Huiyi, CHANG Wenhuan, ZHENG Aijuan, ZHANG Shu . Effects of Dietary Zinc Level on Growth Performance, Slaughter Performance, Serum Immune Indexes and Zinc Emissions of Broilers[J]. Chinese Journal of Animal Nutrition, 2018 , 30(9) : 3494 -3506 . DOI: 10.3969/j.issn.1006-267x.2018.09.019

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