Article (Scientific journals)
A new single-cell protein from Clostridium autoethanogenum as a functional protein for largemouth bass (Micropterus salmoides).
Ma, Shifeng; Liang, Xiaofang; Chen, Pei et al.
2022In Animal Nutrition, 10, p. 99-110
Peer reviewed
 

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Keywords :
Clostridium autoethanogenum protein; Growth; Gut-adherent microbiota; Hepatic and intestinal health; Lipid metabolism; Micropterus salmoides; Food Animals; Animal Science and Zoology
Abstract :
[en] Clostridium autoethanogenum protein (CAP) is a new single-cell protein source originating from inactivated bacteria. An in vitro digestion experiment and an 8-wk growth experiment were conducted to evaluate the molecular weight distribution of the CAP hydrolysate, and the effects of dietary CAP levels on the growth performance, plasma parameters, hepatic and intestinal health, and the diversity of gut-adherent microbiota of largemouth bass (Micropterus salmoides). The fish (initial body weight of 47.99 ± 0.01 g) were fed diets where CAP gradually replaced 0% (CAP0), 12.5% (CAP12.5), 25% (CAP25), 37.5% (CAP37.5) and 50% (CAP50) of low-temperature steam dried anchovy fish meal (LTFM) in the diet. Results showed that the content of peptides below 1,000 Da in the CAP hydrolysate (0.56 mg/mL) was higher than that of the LTFM hydrolysate (0.48 mg/mL). Dietary CAP inclusion had no negative effect on growth performance, while whole-body lipid content significantly reduced in the CAP25 and CAP50 groups (P < 0.05). The plasma alanine aminotransferase activities and triglyceride concentrations in the CAP inclusion groups were significantly lower than those in the CAP0 group (P < 0.05). The plasma aspartate aminotransferase activity was significantly reduced in the CAP37.5 group (P < 0.05). The richness and diversity of the gut-adhesive microbiota and the proportion of Clostridium sensu stricto 12 in the CAP50 group were significantly higher than those in the CAP0 group (P < 0.05). Dietary CAP inclusion inhibited inflammatory responses by down-regulating the mRNA levels of interleukin 1β (IL1β), IL10 and transforming growth factor β1 (P < 0.05) in the liver. The mRNA levels of acetyl-CoA carboxylase 1 were significantly down-regulated in the CAP12.5, CAP25 and CAP37.5 groups (P < 0.05), while that of fatty acid synthase was significantly down-regulated in the CAP50 group (P < 0.05). These results demonstrate that dietary CAP inclusion could improve the hepatic and intestinal health of largemouth bass, and can be helpful to further develop CAP as a functional feed ingredient.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Ma, Shifeng  ;  Université de Liège - ULiège > TERRA Research Centre ; National Aquafeed Safety Assessment Center, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
Liang, Xiaofang;  National Aquafeed Safety Assessment Center, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
Chen, Pei;  National Aquafeed Safety Assessment Center, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
Wang, Jie;  National Aquafeed Safety Assessment Center, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
Gu, Xu;  National Aquafeed Safety Assessment Center, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
Qin, Yuchang;  Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
Blecker, Christophe ;  Université de Liège - ULiège > Département GxABT > Smart Technologies for Food and Biobased Products (SMARTECH)
Xue, Min ;  National Aquafeed Safety Assessment Center, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
Language :
English
Title :
A new single-cell protein from Clostridium autoethanogenum as a functional protein for largemouth bass (Micropterus salmoides).
Publication date :
September 2022
Journal title :
Animal Nutrition
ISSN :
2405-6545
Publisher :
KeAi Communications Co., China
Volume :
10
Pages :
99-110
Peer reviewed :
Peer reviewed
Name of the research project :
National Key Research and Development Program of China
Funders :
NSCF - National Natural Science Foundation of China
China Postdoctoral Science Foundation
Funding text :
This study was supported by the National Key R&D Program of China ( 2019YFD0900200 and 2018YFD0900400 ), the National Natural Science Foundation of China ( 32172981 and 31902382 ), the Agricultural Science and Technology Innovation Program of CAAS in China ( CAAS-ASTIP-2017-FRI-08 ), and China Postdoctoral Science Foundation ( 2021M703544 ).
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