China Animal Husbandry & Veterinary Medicine ›› 2025, Vol. 52 ›› Issue (8): 3551-3562.doi: 10.16431/j.cnki.1671-7236.2025.08.005

• Nutrition and Feed • Previous Articles    

Effects of Different Dose of Condensed Tannins on Growth Performance,Liver and Intestinal Morphology and Intestinal Flora of Lateolabrax maculatus

DONG Ruiqi1,2, QIU Jianqiang2,3, SUN Wenhao2,4, HUANG Wen2, CAO Junming5, ZHAO Hongxia2, CHEN Bing2, WANG Guoxia2, ZHU Xifeng2,6, PENG Kai2   

  1. 1. College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China;
    2. Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China;
    3. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;
    4. College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China;
    5. Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
    6. Guangzhou Fishtech Biotechnology Co., Ltd., Guangzhou 510640, China
  • Received:2025-01-13 Published:2025-08-02

Abstract: 【Objective】 This study was conducted to investigate the effects of different dose of condensed tannins (CT) on growth performance,liver and intestinal morphology and the intestinal flora of Lateolabrax maculatus. 【Method】 Four diets were prepared by adding 0 (CT0),1 (CT1),3 (CT3) and 5 (CT5) g/kg of CT in the basal diet,respectively.Fish (initial weight of 4.38 g±0.01 g) were randomly divided into four groups,with three replicates in each group and a total of 35 fish in each replicate.The feeding trial was lasted for 45 days.At the terminal of the feeding trial,the total quantity,total weight and total food intake of each tank were counted to calculate the growth performance.Three fish were randomly selected from each tank,and the liver and intestine were dissected to prepare paraffin sections and analyze the tissue morphology.Another three fish were randomly selected from each tank to isolate the intestinal contents and determine the composition and diversity of intestinal bacteria. 【Result】 Compared with CT0 group,fish in CT1 group had similar growth performance (P>0.05),the final body weight,weight gain,specific growth rate,and feed intake of fish in CT3 and CT5 groups were lower (P<0.05),whereas the feed coefficient was higher (P<0.05).In CT1,CT3 and CT5 groups,the liver showed varying degrees of vacuolization,fibrosis,and inflammatory infiltration,with the most severe tissue damage observed in CT5 group.Dietary inclusion of CT caused intestinal damage,with fish in CT5 group showing severe atrophy of the intestinal villi and obvious structural damage.At the phylum level,the intestinal microbiota of fish was mainly composed of Proteobacteria and Firmicutes.The relative abundance of Proteobacteria presented a trend of first decreasing and then increasing but was not significant (P>0.05),while the relative abundance of Bacteroidetes,Chlorobi and Chloroflexi presented a trend of first increasing and then decreasing,and they were higher in CT3 group (P<0.05).At the genus level,the intestinal microbiota of fish was mainly composed of Methylobacterium and Ralstonia.Compared with CT0 group,the relative abundance of Methylobacterium in CT1,CT3,and CT5 groups were significantly decreased (P<0.05).The relative abundances of Bacteroides,Faecalibacterium,Roseburia and Sutterella in CT3 group were significantly increased (P<0.05).Compared with CT0 group,the Shannon index in CT3 group was significantly increased (P<0.05). 【Conclusion】 Dietary inclusion of 1 g/kg of CT did not alter the growth performance,whereas 3 and 5 g/kg of CT significantly reduced the feed intake and growth performance,damaged the morphology of liver and intestine,and interfered with the intestinal microflora composition of Lateolabrax maculatus.

Key words: condensed tannins; Lateolabrax maculatus; tissue morphology; intestinal microflora

CLC Number: