Abstract

The effect of dietary supplementation of corn husk meal (CHM) on growth performance, liver antioxidant status and intestinal microbiota in Nile tilapia (Oreochromis niloticus) fingerlings was evaluated. Four experimental groups of fish with initial weight 0.47 ± 0.7 g in triplicate tanks were used; three of them were fed CHM incorporated diets (12.5 g/kg, DH12; 25 g/kg, DH25; and 50 g/kg, DH50), whereas a CHM-free basal diet served as control (DH0). No significant differences were observed in growth performance or feed efficiency in fish fed experimental diets (P > 0.05); however, fish fed the DH50 diet had a significant higher proportion of crude protein of whole-body composition (P < 0.05). Analysis of antioxidant enzyme activity showed significant differences (P < 0.05) with higher superoxide dismutase (SOD) activity in fish fed the DH25 diet, and lower glutathione peroxidase (GPx) activity in fish fed the DH12 diet. No significant differences were found in catalase (CAT) activity between treatments. Fusobacteria, Bacteroidetes and Proteobacteria were the most abundant phyla in all feces samples but no significant differences were found in microbial diversity among diets. Results suggest that CHM is safe for Nile tilapia consumption improving crude protein of whole-body composition and enhancing SOD activity.

Graphic Abstract

中文翻译：

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玉米壳粉在尼罗罗非鱼（Oreochromis niloticus）鱼种功能饮食开发中的用途：对生长性能，抗氧化状态和肠道菌群的影响

摘要

日粮补充玉米壳粉对尼罗罗非鱼生长性能，肝脏抗氧化状态和肠道菌群的影响）评估鱼种。在三个重复的鱼缸中使用了四个初始重量为0.47±0.7 g的鱼的实验组。其中三人饲喂含CHM的日粮（12.5 g / kg，DH12； 25 g / kg，DH25； 50 g / kg，DH50），而不含CHM的基础日粮作为对照（DH0）。鱼饲喂实验饲料的生长性能或饲料效率无显着差异（P> 0.05）；然而，饲喂DH50日粮的鱼的粗蛋白占全身成分的比例显着较高（P <0.05）。抗氧化剂酶活性的分析显示，饲喂DH25日粮的鱼的超氧化物歧化酶（SOD）活性较高，而饲喂DH12日粮的鱼的谷胱甘肽过氧化物酶（GPx）活性较低，抗氧化酶活性存在显着差异（P <0.05）。处理之间过氧化氢酶（CAT）活性未发现显着差异。在所有粪便样品中，梭菌，拟杆菌和变形杆菌是最丰富的门，但饮食之间的微生物多样性没有发现显着差异。结果表明，CHM可安全食用尼罗罗非鱼，改善全身组成的粗蛋白并增强SOD活性。

图形摘要