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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.20.0223    [Accepted] Published online August 21, 2020.
Effects of dietary supplementation with Taiwanese tea byproducts and probiotics on growth performance, lipid metabolism, and the immune response in red feather native chickens
L. W. Chen1  , W. Y. Chuang1  , Y. C. Hsieh1  , H. H. Lin1  , W. C. Lin1  , L. J. Lin2  , S. C. Chang3  , Tzu-Tai Lee1,4,* 
1Department of Animal Science, National Chung Hsing University, Taichung, 402, Taiwan
2School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, 404, Taiwan
3Kaohsiung Animal Propagation Station, Livestock Research Institute, Council of Agriculture, 912, Taiwan
4The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung, 402, Taiwan
Correspondence:  Tzu-Tai Lee, Tel: +886-4-22840366, Fax: +886-4-2286-0265, Email: ttlee@dragon.nchu.edu.tw
Received: 11 April 2020   • Revised: 6 July 2020   • Accepted: 10 July 2020
This study compared the catechin composition of different tea byproducts and investigated the effects of dietary supplementation with green tea byproducts on the accumulation of abdominal fat, the modulation of lipid metabolism, and the inflammatory response in red feather native chickens.
Bioactive compounds were detected and in vitro anti-obesity capacity analyzed via 3T3-L1 preadipocytes. In animal experiments, 320 one-day-old red feather native chickens were divided into 4 treatment groups: control, basal diet supplemented with 0.5% Jinxuan byproduct (JBP), basal diet supplemented with 1% JBP, or basal diet supplemented with 5×106 CFU/kg Bacillus amyloliquefaciens + 5 × 106 CFU/kg Saccharomyces cerevisiae (BA+SC). Growth performance, serum characteristics, carcass characteristics, and the mRNA expression of selected genes were measured.
This study compared several cultivars of tea, but Jinxuan showed the highest levels of the anti-obesity compound epigallocatechin gallate. 3T3-L1 preadipocytes treated with Jinxuan extract significantly reduced lipid accumulation. There were no significant differences in growth performance, serum characteristics, or carcass characteristics among the groups. However, in the 0.5% JBP group, mRNA expression of fatty acid synthase (FAS) and acetyl-CoA carboxylase (ACC) were significantly decreased. In the 1% JBP group, FAS, ACC and peroxisome proliferator-activated receptor γ (PPAR γ) levels were significantly decreased. Moreover, inflammation-related mRNA expression levels were decreased by the addition of JBP.
JBP contained abundant catechins and related bioactive compounds, which reduced lipid accumulation in 3T3-L1 preadipocytes, however there was no significant reduction in abdominal fat. This may be due to a lack of active anti-obesity compounds or because the major changes in fat metabolism were not in the abdomen. Nonetheless, lipogenesis-related and inflammation-related mRNA expression were reduced in the 1% JBP group. In addition, dietary supplementation with tea byproducts could reduce the massive amount of byproducts created during tea production and modulate lipid metabolism and the inflammatory response in chickens.
Keywords: Green Tea By-product; Red Feather Native Chicken; Anti-obesity; Lipid Metabolism; Anti-inflammation

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