Effects of dietary arginine levels on antioxidative state and serum biochemical indices in juvenile hybrid sturgeon
A total of 630 juveniles of hybrid sturgeon (Acipenser schrenkii ♀ ×A.baeri ♂) with initial body weight of (3.63±0.08) g were randomly divided into 7 groups with 3 replicates per group and 30 fish per replicate and fed seven isonitrogenous and isolipidic diets containing arginine levels of 1.76％,2.05％,2.36％,2.05％,2.93％,3.24％ and 3.53％ for 8 weeks to study effects of dietary arginine levels on antioxidative state,and serum biochemical indices of juvenile hybrid sturgeon.The results showed that there were significantly higher activity of superoxide dismutase (SOD) and content of glutathione (GSH) in intestine and lower content of malonaldehyde (MDA) in midgut of the juvenile hybrid sturgeon in 2.64％ and 2.93％ groups than those in 1.76％ group (P＜0.05).There were no significant differences in contents of MDA in foregut and hindgut (P＞0.05),and in MDA content and SOD activity in serum and liver (P＞0.05) in the juveniles fed the diets containing various arginine levels.Significantly elevated contents of serum total protein (TP) and albumin (ALB),and significantly lower activity of glutamic oxalacetic transaminase (AST)were observed in the juveniles in 2.64％ group (P＜0.05).There were significantly lower content of serum urea nitrogen (BUN) (P＜0.05),and significantly higher serum glucose (GLU) in the juveniles in 2.64％ and 2.93％ groups (P＜0.05).The significantly lower contents of serum triglyceride (TG) were found in the juveniles in 2.36％,2.64％,2.93％ and 3.24％ groups (P＜0.05),without significant differences in contents of globulin (GLB) and total cholesterin (TCHO) and the activity of glutamicpyruvic transaminase (ALT) in serum (P＞0.05).The findings indicated that appropriate dietary arginine levels led to significant increase in ability of antioxidative state,improvement of metabolism and protein synthesis in fish.Quadratic regression analysis of content of midgut MDA and serum BUN indicates that the optimal dietary arginine requirement is recommended to be 2.73％ and 2.75％,respectively.
argininehybrid sturgeonantioxidative stateserum biochemical index
NETL
NSTL
万方数据
维普
