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RESEARCH ARTICLE

Dietary zinc and growth, carcass characteristics, immune responses, and serum biochemistry of broilers

Shizhen Qin A , Lingyan Zhang B , Fang Ma A , Yanzhuo Che A , Haibo Wang A and Zhaoguo Shi A C
+ Author Affiliations
- Author Affiliations

A Faculty of Animal Science and Technology, Gansu Agricultural University, No. 1 Yingmen Village, Anning District, Lanzhou, Gansu Province 730070, P.R. China.

B Institute of Laboratory Animal Science, Guizhou University of Traditional Chinese Medicine, Qingnan Road, Huaxi University Town, Gui'an New District, Guiyang, Guizhou Province 550025, P. R. China.

C Corresponding author. Email: 1991378985@qq.com

Animal Production Science 60(6) 815-822 https://doi.org/10.1071/AN18763
Submitted: 23 December 2018  Accepted: 7 August 2019   Published: 5 March 2020

Abstract

Context: Zinc (Zn) is an essential trace element, and plays an important role in growth, bone formation, feathering and appetite of broilers. Accurate supplementation of this mineral is the aim of the animal husbandry. Thus, it is crucial to optimise the Zn concentration in the diet of broilers.

Aims: The present study was performed to investigate the effects of dietary supplementation of Zn on the growth performance, carcass characteristics, immune responses and serum biochemistry of broilers.

Methods: A total of 180 1-day-old male broilers (Arbor Acres) were randomly allotted by bodyweight to one of five treatments with six replicates of six birds each. The birds were fed a Zn-unsupplemented corn–soybean meal basal diet (27.75 or 26.88 mg/kg Zn by analysis) or one of the four Zn-supplemented diets, which were the basal diet supplemented with 40, 80, 120, or 160 mg Zn /kg as Zn sulfate (reagent grade ZnSO4•7H2O), for 42 days.

Key results: No differences were detected on growth performance or carcass characteristics among treatment groups. However, the total protein concentration and albumin concentration tended (P = 0.09) to increase with an increasing concentration of dietary Zn. The antibody titer of Newcastle disease (ND), and alkaline phosphatase (ALP) in serum on Day 21 were significantly increased (P < 0.05) as the Zn supplementation increased in broiler diets.

Conclusions: These results indicated that dietary Zn supplementation improves the serum antibody titer of ND and ALP activity of broilers, and 86 mg Zn/kg was appropriate for broilers when fed a corn–soybean meal diet in the early stage.

Implications: The present results have provided scientific basis for broiler production, and accurate supplementation of Zn would effectively improve the growth performance and reduce production costs.

Additional keywords: chick, microelement, requirement.


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