Interaction between dietary lipid and bile acids on the growth performance and lipid metabolism in abalone Haliotis discus hannai Ino

A 105-day feeding trail was conducted to evaluate the effects of dietary lipid and bile acids levels as well as their interactions on the growth, digestion and lipid metabolism in abalone Haliotis discus hannai (initial weight: 5.29 ± 0.02 g). Eight isonitrogenous diets with two levels of lipid (4.3% and 6.3%) and four levels of bile acids (0, 15, 60 and 240 mg/kg) were formulated in a 2 × 4 two-factor design. The results showed that 6.3% of dietary lipid decreased the weight gain rate (WGR) of abalone, which increased as the dietary bile acids level increasing from 0 mg/kg to 60 mg/kg. The treatment with the highest WGR contained 4.3% of dietary lipid and 60 mg/kg of dietary bile acids. In the groups with 4.3% of dietary lipid, the expression of genes involved in lipid transport and lipolysis was increased (P