Effects of dietary soybean lecithin on growth performances, body composition, serum biochemical parameters, digestive and metabolic abilities in largemouth bass Micropterus salmoides

Abstract

We conducted an 8-week feeding trial to explore the effects of dietary soybean lecithin (SBL) on growth performance and metabolic abilities in juvenile largemouth bass Micropterus salmoides. The addition of 4 % SBL to the feed significantly increases the specific growth rate (SGR), carcass ratio (CR) and crude protein in the fish body and muscle compared with control groups (0 %) (P 0.05). In addition, 4 % SBL elevated activities and mRNA levels of FAS in the fish liver compared with controls (P < 0.05). Similarly, 4 % SBL increased the transcriptional levels of genes involved in triglycerides (TG) synthesis (GK, GPAT3 and DGAT2) and lipid transport (FATP1, CD36, APOB100 and FABP10) in the fish liver compared with controls (P < 0.05). Moreover, the mRNA expression levels of up-stream regulatory elements involved in metabolic signal processing (AKT1, mTOR, SREBP1 and PPARγ) were also markedly heightened in fish fed 4 % SBL compared with controls (P < 0.05). Together with these results, it indicated 4 % dietary SBL could increase growth and digestive abilities, improve serum biochemical indicators and hormones, promote glycolysis and glycogen synthesis, and facilitate lipid synthesis and transport in juvenile largemouth bass Micropterus salmoides.

Keywords

• Soybean lecithin
• Micropterus salmoides
• Growth performances
• Hormone
• Metabolic ability