Effects of Dietary Soybean Oil Replacement by Silkworm,Bombyx moriL., Chrysalis Oil on Growth Performance, Tissue Fatty Acid Composition, and Health Status of Juvenile Jian Carp,Cyprinus carpiovar. Jian

Abstract

AbstractFive triplicate groups containing 15 Jian carp (33.51 ± 1.91 g) were fed five isonitrogenous (30%) and isolipidic (8%) diets, with an increase in silkworm chrysalis oil (SCO) to replace soybean oil (SO) at 0 (SO), 25 (SCO25), 50 (SCO50), 75 (SCO75), or 100% (SCO100) levels for 59 d. Results showed that theSCO50andSCO75groups presented higher thermal growth coefficients than theSOandSCO100groups and lower feed conversion ratios than theSCO100group (P < 0.05). Moreover, the 50%SCO‐supplemented level decreased hepatopancreas lipid content and increased muscle crude protein content (P < 0.05). Meanwhile, α‐linolenic acid, n‐3 polyunsaturated fatty acid (PUFA) content, and n‐3/n‐6PUFAratio increased in the hepatopancreas, and intraperitoneal fat and muscle as the replacement ofSOincreased (P < 0.05). No significant differences of the serum biochemical indices and hepatopancreatic malondialdehyde content were found among groups (P > 0.05), but hepatopancreatic superoxide dismutase activities in theSCO25andSCO50groups were significantly higher than those in the other groups (P < 0.05). There was no significant difference in muscularis coat thickness, fold height, and fold width in the mid‐intestine (P>0.05). Overall, up to 50 or 75% replacement ofSObySCOin the diet of Jian carp could improve growth performance without affecting the health status of the fish.