Abstract
This study was to investigate the effects of dietary zinc (Zn) supplementation on performance, zinc transporter gene expression, and immune function in aged laying hens. In experiment 1, twenty 31-week-old hens (young) and twenty 60-week-old hens (old) with the same genetic background were fed with the same diet for 4 weeks. In experiment 2, a basal diet supplemented with zinc sulfate (ZnS) and zinc glycine chelate (ZnG) at 30, 60, 90, and 120 mg Zn/kg to constitute nine experimental diets. Eight hundred and ten 60-week-old layers were distributed in a completely randomized experimental design with 9 treatments, 6 replicates of 15 birds each, and birds were fed for 10 weeks. In experiment 1, results showed that zinc and metallothionein (MT) concentration in the shell gland of old hens was significantly lower than young layers (P < 0.05). Zinc transporters ZnT1, 4, 5, 6, and 7 messenger RNA (mRNA) abundance in old layers were significantly lower versus the young (P < 0.05). In experiment 2, results indicated that dietary zinc supplementation did not significantly affect the laying rate, average feed intake, egg weight, feed conversion efficiency, broken egg rate, or mortality (P > 0.05). Supplemental ZnG significantly improved eggshell breaking strength than ZnS, with a higher alkaline phosphatase (ALP) activity and more abundant ZnT4 expression in shell gland versus ZnS (P < 0.05). ZnG supplementation at 90 mg Zn/kg affected the duodenal mucus by significantly increasing ZnT1, 6, 7, ZIP13, and MT-4 mRNA level (P < 0.05). Zinc level significantly increased bovine serum albumin (BSA) antibody concentration on 14 day after BSA injection (P < 0.05). Supplementation of ZnG improved eggshell quality of aged layers by upgrading zinc transporter expression in the shell gland and intestine also enhanced humoral immunity.
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All datasets used and/or analyzed during this study are available from the corresponding author upon request.
Abbreviations
- ALP:
-
alkaline phosphatase
- BSA:
-
bovine serum albumin
- Con:
-
control
- ELISA:
-
enzyme-linked immunosorbent assay
- ER:
-
endoplasmic reticulum
- GFAAS:
-
graphite furnace atomic absorption spectrometry
- mRNA:
-
messenger RNA
- MT:
-
metallothionein
- MTF-1:
-
metal-response element-binding transcription factor-1
- qRT-PCR:
-
quantitative real-time polymerase chain reaction
- SLC:
-
solute-linked carrier
- TGN:
-
trans-Golgi network
- ZIP:
-
Zrt- and Irt-like proteins
- Zn:
-
zinc
- ZnG:
-
zinc glycine chelate
- ZnS:
-
zinc sulfate
- ZnT:
-
Zinc transporter
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Acknowledgments
The authors would like to thank the staff of the Department of Animal Science and Technology of the China Agricultural University for their valuable assistance in sample collecting. The authors are also grateful to Dr. Kenny Ray Hazen for his linguistic help.
Funding
The State Key Development Program (2016YFD0501202) supported this study.
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Qiqi Han performed the animal experiment, established sample and statistical analysis and wrote the manuscript; Yuming Guo designed the research, interpreted the data; Bingkun Zhang assisted with the design of the research and data analysis; Wei Nie adjusted the manuscript writing and experiment designing; all authors read and approved the final manuscript.
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All procedures of animal care and use for this experiment were approved by China Agricultural University Institutional Animal Care and Use Committee (No. CAU20160910-2).
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Han, Q., Guo, Y., Zhang, B. et al. Effects of Dietary Zinc on Performance, Zinc Transporters Expression, and Immune Response of Aged Laying Hens. Biol Trace Elem Res 196, 231–242 (2020). https://doi.org/10.1007/s12011-019-01916-y
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DOI: https://doi.org/10.1007/s12011-019-01916-y