WANG Lian-sheng, XU Hong, WANG Yang, WANG Chang-an, LI Jin-nan, ZHAO Zhi-gang, LUO Liang, DU Xue, XU Qi-you?
The present study was aimed to investigate effects of dietary vitamin K3 on growth and antioxidation in Siberian sturgeon Acipenser baerii.A total of 630 individuals of Siberian sturgeon with initial body weight of 5.14 g were randomly assigned to 7 treatments and fed diets supplemented with Menadione Nicotinamide Bisulfite（MNB）at 0,5,10,20,40,80,and 2000 m g / kg,that is,containing vitamin K3 of 0,2.88,4.84,10.08,26.42,40.86,and 990.00 mg / kg,with 3 replicates per treatment for 56 days.The results showed that levels of vitamin K3 had no significant effect（P 〉 0.05） on weight gain rate（WGR）,specific growth rate（SGR） and feed conversion ratio（FCR）,the maximal WGR and SGR in the 26.24 mg /kg group,and the minimal WGR and SGR in 990 mg /kg group.The total antioxidant capacity（T-AOC） in hepatopancreas was shown to be significantly higher in the fish fed the diets containing 10.08,and 26.24 vitamin K mg / kg than in the fish fed the control diet（P 〈 0.05）.There was significantly lower T-AOC in 990 mg / kg group than that in 2.88,4.84,10.08,26.24 mg / kg vitamin K3groups（P 〈 0.05）.The Siberian sturgeon juveniles fed the diets containing 4.84,10.08,and 26.24 mg / kg vitamin K3 had significantly higher reduced glutathione（GSH） in kidney（P 〈 0.05）,and the juveniles fed the diets containing 4.84,10.08,26.42,and 40.86 mg / kg vitamin K3 had significantly higher T-AOC in kidney（P 〈0.05）.However,the juveniles fed the diets containing 990.00 mg / kg vitamin K3 had significantly lower GSH and T-AOC than the juveniles fed the diets containing 4.84,10.08,26.42,and 40.86 mg / kg vitamin K3did（P 〈0.05）.The levels of vitamin K3 had no significant effect on superoxide dismutase（SOD） or malondialdehyde（MDA） in hepatopancreas and kidney（P 〉 0.05）.In conclusion,there was no significant effect of levels of vitamin K3 on growth in Siberian sturgeon,and quadratic regression analysis of T-AOC indicated that the optimal dietary vitamin K3 requirement was estimated to
