KMID : 0545120230330101390
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Journal of Microbiology and Biotechnology 2023 Volume.33 No. 10 p.1390 ~ p.1401
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Dietary Exogenous ¥á-Amylase Modulates the Nutrient Digestibility, Digestive Enzyme Activity, Growth-Related Gene Expression, and Diet Degradation Rate of Olive Flounder (Paralichthys olivaceus)
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Md. Tawheed Hasan
Kim Hyeon-Jong Hur Sang-Woo Jeong Seong-Mok Kim Kang-Woong Lee Seung-Han
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Abstract
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In this study, a 12-week feeding experiment was conducted to characterize the effects of exogenous ¥á-amylase on the growth, feed utilization, digestibility, plasma ¥á-amylase activity, feed degradation rate, and fecal particle size of olive flounder (Paralichthys olivaceus). Diet was supplemented with 0 (AA0; control), 100 (AA100), 200 (AA200), or 400 (AA400) mg/kg of ¥á-amylase, respectively. Fish (273.1 ¡¾ 2.3 g) were stocked into 12 tanks (25 fish/1,000-L tank) and 3 tanks were randomly selected for each diet group. As a result, ¥á-amylase was found to have no significant effects (p ¡Ã 0.05) on the growth, feed utilization parameters, and whole-body proximate compositions. ¥á-Amylase-treated fish exhibited only a significant increase in the apparent digestibility coefficient of carbohydrates compared to the controls. In addition, in vitro analyses revealed that ¥á-amylase dose-dependently increased (p < 0.05) the feed degradation rate, while photographs of the intestinal content after 2, 4, and 8 h of feeding demonstrated an improved degradation rate in the ¥á-amylase-treated groups. Plasma ¥á-amylase content was higher in the AA200 and AA400 groups, whereas the control group produced significantly larger-sized fecal particles (90% size class) than these two groups. In the intestine, no changes were observed in the expression levels of the immune-related TNF-¥á, IL-1¥â, IL-2, immunoglobulin-M, HSP-70, lysozyme, and amylase alpha-2A. However, growth-related genes IGF-1, IGF-2, TGF-¥â3, and growth hormone genes were upregulated in muscle tissues. Collectively, exogenous ¥á-amylase has positive roles in the modulation of the digestibility coefficient, blood ¥á-amylase concentration, growth-related gene expression, and diet degradation for improved digestion in olive flounder.
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KEYWORD
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Aqua-feed, feed additive, olive flounder, digestive enzymes, alpha-amylase, digestibility
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