数字农科院2.0

Effects of chito-oligosaccharides supplementation on growth performance, intestinal cytokine expression, autochthonous gut bacteria and disease resistance in hybrid tilapia Oreochromis niloticus female x Oreochromis aureus male

文献类型： 外文期刊

作者： Qin, Chubin;Zhang, Yuting;Liu, Wenshu;Xu, Li;Yang, Yalin;Zhou, Zhigang

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关键词： Chito-oligosaccharides;Chitosan-oligosaccharides;Immunity;Tilapia

期刊名称： FISH & SHELLFISH IMMUNOLOGY

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收录情况： SCI

摘要： We investigated the effects of incorporating chitinase (ChiB565)-hydrelyzed shrimp shell chitin into the diet of hybrid tilapia (Oreochromis niloticus female x Oreochromis aureus male) with regard to production, intestinal immune status and autochthonous gut bacteria, and protection against bacterial pathogen Aeromonas hydrophila. Five experimental diets were formulated by supplementing the basal diet with the hydrolyzed shrimp shell chitin (0.0%, T1 control; 0.8%, T3; 1.6%, T4; or 2.4%, T5) or 0.1% commercial chitosan-oligosaccharides as commercial recommendation dose (T2, positive control). After a 35-day feeding trial, we found no significant difference in weight gain, feed conversion ratio or survival rate in tilapia among all treatment groups. However, the levels of mRNAs encoding the pro-inflammatory protein tumor necrosis factor-a and the stress-response protein heat shock protein 70 were much lower in groups 12, T3, T4 and T5 (p < 0.001). The levels of transforming growth factor-beta were higher in groups T2 and T4 (p < 0.001 and p < 0.0001, respectively). In addition, group T3 and T4 with 0.8% and 1.6% hydrolyzed shrimp shell chitin supplementation respectively changed marginally their autochthonous gut bacteria (0.60 < C-5 < 0.80). When challenged with A. hydrophila, the mortality of groups fed chito-oligosaccharides was lower than the control, especially in groups T4 and T5 (p <0.05). These results indicate that dietary intake of chito-oligosaccharides can improve intestinal health, changed autochthonous gut bacteria, and improve resistance to infection by A. hydrophila, even with higher efficiency than receiving the manufacturer recommended dose of the commercial chitosan oligosaccharides

分类号： S9

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