Effect of bile acids in high-lipid diet on growth performance and muscle fatty acid composition of gibel carp (Carassius auratus gibelio).

The experiment was to investigate the effect of adding bile acid to high-lipid diet on growth performance, muscle nutrition and fatty acid composition of gibel carp. A total of 450 healthy and initial body weight (32.37±0.13) g juvenile fish were randomly divided into five groups, with three replicates in each group and 30 fish in each replicate. Five kinds of iso-nitrogen and iso-lipid feed were prepared by adding 0 (BA0), 200 (BA200), 400 (BA400), 600 (BA600) and 800 mg/kg (BA800) bile acids to basic feed containing 12% soybean oil, respectively. The experiment lasted for 8 w. The results showed that compared with BA0, FBW of BA400 and BA600 gibel carp was significantly increased (P<0.05), WGR of BA600 was significantly increased (P<0.05), VSI was significantly decreased (P<0.05). The FCR of gibel carp in BA200, BA400 and BA600 was significantly decreased (P<0.05). HSI of all experimental groups was significantly decreased (P<0.05). CF of BA800 was significantly increased (P<0.05). Compared with BA0, muscle crude fat content of experimental groups was significantly decreased (P<0.05), and MUFA content was significantly increased (P<0.05). The crude protein content of gibel carp in BA400 and BA600 were significantly increased (P<0.05). The crude ash content of gibel carp in BA600 and BA800 were significantly decreased (P<0.05). The study indicates that adding 400~600 mg/kg bile acid to high-lipid diet can promote growth of gibel carp, increase the utilization rate of feed, promote fat digestion, absorption and decomposition for energy supply, improve muscle fatty acid composition. [ABSTRACT FROM AUTHOR]