Effects of Dietary Fermented Soybean Meals on Tissue Lipid Level, Bile Acid Concentration, Lipase Activity and Lipid Digestibility in Pompano Fish (Trachinotus blochii)
Effects of Dietary Fermented Soybean Meals on Tissue Lipid Level, Bile Acid Concentration, Lipase Activity and Lipid Digestibility in Pompano Fish (Trachinotus blochii)
Hung Van Mai1, Tuan Duc Nguyen2, Nang Thu Tran Thi3 and Hung Phuc Nguyen4*
ABSTRACT
This study aimed to examine effects of three different fermented soybean meals (FSBM1, FSBM2 and FSBM3) on lipid digestion status, including plasma lipid level, liver and muscle lipid contents, bile acid (BA) concentration, lipase activity, and lipid apparent digestibility coefficient (ADC) in pompano. The FSBM1 was produced by fermentation of defatted soybean meal (SBM) with Bacillus subtilis B3. The FSBM2 and FSBM3 were commercially available products, which were produced by fermentation of SBM with Lactobacillus spp. Five diets were formulated and denoted as FMD (fish meal-based diet), SBMD (SBM-based diet), FSBM1D (FSBM1-based diet), FSBM2D (FSBM2-based diet) and FSBM3D (FSBM3-based diet). Each diet was fed twice daily to three groups of juvenile pompano (20 fish/group, 36 g/fish) for 4 weeks. The results showed that the plasma total cholesterol level, liver lipid content, intestinal total BA concentration, intestinal lipase activity, and lipid ADC were significantly higher in the FSBM1D and FSBM3D groups than the SBMD group (P < 0.05). These parameters tended to increase in the FSBM2D group as compared to the SBMD group, although the differences were not significant. All the FSBM dietary groups had significantly lower tissue lipid contents, gallbladder and intestinal total BA concentrations, intestinal lipase activities, and lipid ADCs than fish fed FMD (P < 0.05). The findings of the present study indicated that fermentation of SBM was beneficial to lipid digestion in pompano, and suggested that dietary inclusion of FSBM1 and FSBM3 might improve growth performance of pompano fish fed SBM-based diets.
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