Effects of Chinese herbal compound in feed on growth, digestive enzyme and immune-related enzyme activities of Litopennaus vannamei
To investigate the effects of Chinese herbal compound on the growth, digestive enzyme activities and immune-related enzyme activities of litopenaeus vannamei, five groups with 3 replicates per treatment of feed containing Chinese herbal feed additives (mainly Astragalus membranaceiu and Baphicacanthus cusia) at 0, 0.1% , 0. 2% , 0. 4% and 0. 8% , respectively, were fed to L vannamei [ initial weight (4. 14 ±0. 06) g] for 56 d. Results reveal that the survival of L vannamei in test groups is higher than that in the control , significantly higher in 0. 2% group ( P < 0. 05 ). The relative weight gain in 0. 2% and 0. 8% groups is significantly higher thanthat in the control (P < 0. 05). The digestive enzyme activities in the liver and intestine in the test groups are significantly higher than those in the control, significantly higher in 0. 2% group (P<0. 05). The intestinal cathepsin and amylase in the 0. 1% and 0. 4% groups are higher than those in the control ( P < 0. 05 ). The AKP in 0. 2% group is significantly higher than that in the other groups ( P < 0. 05). The SOD in the test groups is higher than that in the control. The POD decreases and then increases with increasing a-mount of Chinese herbs, especially that 0.4% group decreases significantly (P < 0. 05). In conclusion, Chinese herbal compound in feed ( optimum supplemental level: 0. 2% ) can improve the growth, digestive enzyme activities and immune-related enzyme activities of L. Vannamei.
Chinese herbsLitopennaus vannameigrowthdigestiveimmunity