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Effects of plants extracts on growth,factors associated with immunity and antioxidation,and disease resistance of allogynogenetic crucian carp(Carassius auratus gibelio var.E'erqisi,Bloch)

LIU Bo1,ZHOU Qun-lan1,HE Yi-jin1,HE Qing-guo1,XIE Jun1,XU Pao1,ZHOU Ling2(1.Key Open Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology,Ministry of Agriculture,Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences,Wuxi 214081,China;2.Wuxi Zhengda Poultry Co.Ltd,Wuxi 214112,China)  
A total of 360 allogynogenetic crucian carp were allotted into four groups randomly.The control group was fed with basal diet,the others were the treated groups fed with basal diet supplemented with 6 mg/kg flavomycin,200 mg/kg plants extracts and 300 mg/kg plants extracts,respectively.After 70 days of feeding,the growth,lysozyme activity,nitric oxide content(NO),superoxide dismutase activity(SOD),catalase activity(CAT),malondialdehyde content(MDA),and disease resistance of allogynogenetic crucian carp were investigated.The results showed that ingestion of 300 mg/kg plants extracts significantly increased growth gain rate,and specific growth rate;ingestion of 200-300 mg/kg plants extracts apparently enhanced serum Lysozyme activities,NO contents,SOD activities,and significantly decreased feed conversion rates and serum MDA contents,ingestion of 6 mg/kg flavomycin had no significant effect on growth gain rate,and specific growth rates;however apparently increased viserosomatic indices,hepatosomatic indices,and fullness indices,serum lysozyme activity,NO content,and CAT activity.The artificial infection with A.hydrophila caused mortality in all groups,but the control was the highest.Therefore it indicates that ingestion of 200-300 mg/kg dose of plants extracts could improve immunity and antioxidation ability,help to prevent the pathogeny infection and promote fish growth.
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