Effects of L-carnitine Supplementation in Diets on Growth Performance,Digestive Ability and Non-Specific Immunity of Pacific White Shrimp(Litopenaeus vannamei)
This experiment was conducted to study the effects of L-carnitine supplementation in diets on growth performance,digestive ability and non-specific immunity of Pacific white shrimp(Litopenaeus vannamei).A total of 480 juvenile Pacific white shrimp with initial body weight of(0.40±0.02)g were randomly divided in-to 3 groups with 4 replicates per group and 40 shrimp per replicate.Shrimp in the control group were fed a bas-al diet,and others in experimental groups were fed experimental diets which L-camitine supplemental levels were 0.02％and 0.04％,respectively.The experiment lasted for 8 weeks.The results showed as follows:1)the weight gain rate and specific growth rate of 0.04％ L-carnitine group were significantly higher than those of the control group(P＜0.05),and the feed conversion ratio of 0.04％ L-carnitine group was significantly lower than that of the control group(P＜0.05).There was no significant difference in survival rate of Pacific white shrimp among all groups(P＞0.05).2)The whole shrimp moisture content of 0.02％ L-carnitine group and 0.04％ L-carnitine group was significantly higher than that of the control group(P＜0.05).There were no sig-nificant differences in the contents of crude protein,ether extract and ash in whole shrimp of Pacific white shrimp among all groups(P＞0.05).3)The intestinal muscular layer thickness of 0.02％ L-carnitine group was significantly higher than that of the control group(P＜0.05).There was no significant difference in intesti-nal villus height of Pacific white shrimp among all groups(P＞0.05).4)The activities of protease and lipase in intestine of 0.04％ L-carnitine group were significantly higher than those of the control group(P＜0.05).There was no significant difference in intestinal amylase activity of Pacific white shrimp among all groups(P＞0.05).5)The activities of acid phosphatase and lysozyme in hepatopancreas of 0.04％ L-carnitine group were significantly higher than those of the control group(P＜0.05),and the activities of alkaline phosphatase and catalase in hepatopancreas of 0.02％ L-carnitine group and 0.04％ L-carnitine group were significantly higher than those of the control group(P＜0.05).In conclusion,adding appropriate level of L-carnitine in diet can improve the growth performance,feed efficiency,digestive ability and non-specific immunity of Pacific white shrimp.Under the conditions of this experiment,the appropriate supplemental level of L-carnitine in diet of Pa-cific white shrimp is 0.04％.[Chinese Journal of Animal Nutrition,2023,35(12):7978-7987]
L-carnitinePacific white shrimpgrowth performancedigestive abilitynon-specific immunity
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