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DOI: https://doi.org/10.5713/ab.20.0656    [Accepted] Published online January 1, 2021.
Effects of Artemisia argyi flavonoids on growth performance and immune function in broilers challenged with lipopolysaccharide
Shuo Yang1  , Jing Zhang1  , Yang Jiang1  , Yuan Qing Xu1  , Xiao Jin1  , Su Mei Yan1  , Bin lin Shi1,* 
College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China
Correspondence:  Bin lin Shi, Tel: +81-0471-4309170, Fax: +81-0471-4309170, Email: shibinlin@yeah.net
Received: 17 September 2020   • Revised: 10 November 2020   • Accepted: 16 December 2020
Abstract
Objective
This research aimed to study the effects of Artemisia argyi flavonoids (AAF) supplemented in diets on the growth performance and immune function of broiler chickens challenged with lipopolysaccharide (LPS).
Methods
A total of one hundred and ninety-two 1-d-old broiler chicks were assigned into 4 treatment groups, which were, respectively, fed a basal diet(control), fed a diet with 750 mg/kg AAF, fed a basal diet, and challenged with LPS, fed a diet with 750 mg/kg AAF, and challenged with LPS. Each treatment had six pens with 8 chicks per pen. On days 14, 16, 18, 20 (stress phase I) and 28, 30, 32, 34 (stress phase II), broilers were injected with LPS (500 μg/kg BW) or an equivalent amount of saline.
Results
The results demonstrated that dietary AAF significantly improved the body weight (d 21) and alleviated the decrease of average daily gain in broilers challenged with LPS on d 21 and d 35 (p<0.05). Dietary AAF increased bursa fabricius index, and dramatically attenuated the elevation of spleen index caused by LPS on d 35 (p<0.05). Furthermore, serum interleukin-6 (IL-6) concentration decreased with AAF supplementation on d 21 (p<0.05). Diet treatment and LPS challenge exhibited a significant interaction for the concentration of IL-1β (d 21) and IL-6 (d 35) in serum (p<0.05). Additionally, AAF supplementation mitigated the increase of IL-1β, IL-6 in liver and spleen induced by LPS on d 21 and 35 (p<0.05). This study also showed that AAF supplementation significantly reduced the expression of IL-1β (d 21) and NF-κBp65 (d 21 and 35) in liver (p<0.05), and dietary AAF and LPS treatment exhibited significant interaction for the gene expression of IL-6 (d 21), TLR4 (d 35) and MyD88 (d 35) in spleen (p<0.05).
Conclusion
In conclusion, AAF could be used as a potential natural immunomodulator to improve growth performance and alleviate immune stress in broilers challenged with LPS.
Keywords: Flavonoid; Immunomodulation; Lipopolysaccharide Challenge; Broiler


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