Effects of different protein and lipid levels on the growth performance and intestinal microflora of loach(Paramisgurnus dabryanus)  

作　　者：Zirui Wang Shuyao Li Qiubai Zhou Jinhua Zhang Yongan Li Youjie Li Zhiwen Yuan Guanghua Huang 

机构地区：[1]College of Animal Science and Technology,Jiangxi Agricultural University,Nanchang 330045,China [2]Key Laboratory of Featured Hydrobios Nutritional Physiology and Healthy Breeding,Nanchang,330045,China

出　　处：《Animal Nutrition》2023年第2期229-239,共11页动物营养（英文版）

基　　金：supported by National Natural Science Foundation of China(No.31860732);China Agriculture Research System of MOF and MARA(CARS-46);Graduate Innovative Special Fund Project of Jiangxi Province(YC2021-S337).

摘　　要：The aim of this study was to examine the effects of dietary protein and lipid levels on the growth per-formance and homeostasis of the intestinal flora in Paramisgurnus dabryanus.An 8-week 3×3 two-factorial experiment was conducted to investigate the interaction between dietary crude protein(CP:30%,35%,40%)and ether extract(EE:6%,10%,14%)on the growth rate and the intestinal microflora of P.dabryanus.A total of 2,160 fish(5.19±0.01 g)were randomly allotted to 36 aquariums each with 60 fish.Fish were fed the experimental diet twice daily.Results revealed that weight gain rate(WGR),specific growth rate(SGR),protein efficiency ratio and net protein utilization significantly increased when increasing protein levels from 30%to 40%(P<0.05).Both WGR and SGR enhanced first but reduced thereafter with maximum value at 10%lipid level as dietary lipid increased from 6%to 14%(P<0.05).Significant interactions between protein and lipid were found with feed conversion rate,lipid efficiency ratio and net lipid utilization(P<0.05).At the phylum level,Proteobacteria and Actinobacteria were the dominant bacteria;at the genus level,Burkholderia-Caballeronia-Paraburkholderia was the dominant bacteria.Fish fed the diet containing 10%lipid had a higher abundance of Proteobacteria and unclassi-fied_f_Eenterobacteriaceae than those fed the 14%lipid diet,and a higher abundance of Rhodobacter than those fed the 6%lipid diet(P<0.05).Analysis of the predicted functions showed that metabolism in the intestine of fish in the CP40EE10 group was more active than that in CP30EE14 group.Polynomial regression analysis found that a diet containing 40.87%protein and 9.88%lipid can be considered optimal for P.dabryanus.

关 键 词：Paramisgurnus dabryanus Protein/lipid ratio Growth performance Feed utilization Intestinal microflora 

分 类 号：S966.4[农业科学—水产养殖]