A study was conducted to evaluate the effects of various microbial‐derived additives on the growth performance, non‐specific immunity and disease resistance of Litopenaeus vannamei. Shrimp were fed diets supplemented with 5 g/kg multi‐species probiotic (MSP), 5 g/kg dried lactic acid bacteria fermentate (LF), 5 g/kg dried yeast fermentate (YF), 7.5 g/kg cell wall‐broken yeast extract (BY), 5 g/kg multi‐enzyme preparation (MEP), or 50 g/kg complex probiotics and enzyme (CPE). Results showed that the specific growth rate of shrimp in all treatment groups, except the LF group, was significantly enhanced (p < .05). The activities of lipase and trypsin in the hepatopancreas of the MSP and MEP groups, and amylase of the BY group, increased significantly (p < .05). The activities of all non‐specific immune enzymes in serum in MSP, BY group and the activity of haemocytes respiratory burst in the MSP, YF, BY and MEP group were significantly increased (p < .05). In the Vibrio challenge test, the cumulative mortality of shrimp in all treatment groups, except MSP group, was significantly lower than in the controls (p < .05). In conclusion, various microbial‐derived additives provided distinct benefits to the growth performance and health of shrimp. Particularly, complex probiotics and enzyme exhibited the all‐round positive influence and significantly improved growth performance, immunity capacity and disease resistance.

中文翻译：

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太平洋白对虾凡纳滨对虾的生长性能，非特异性免疫和副溶血性弧菌对各种微生物衍生添加剂的响应

进行了一项研究，以评估各种微生物添加剂对凡纳滨对虾生长性能，非特异性免疫和抗病性的影响。虾饲料中添加了5 g / kg多物种益生菌（MSP），5 g / kg干乳酸菌发酵液（LF），5 g / kg干酵母发酵液（YF），7.5 g / kg细胞壁破碎的日粮酵母提取物（BY），5 g / kg多酶制剂（MEP）或50 g / kg复合益生菌和酶（CPE）。结果表明，除LF组外，所有处理组中虾的比生长速率均显着提高（p  <.05）。MSP和MEP组的肝胰脏中的脂肪酶和胰蛋白酶的活性，BY组的淀粉酶的活性显着增加（p <.05）。MSP，BY组的血清中所有非特异性免疫酶的活性以及MSP，YF，BY和MEP组的血细胞呼吸爆发的活性均显着增加（p  <.05）。在弧菌激增试验中，除MSP组外，所有处理组中虾的累积死亡率均显着低于对照组（p <  .05）。总之，各种微生物来源的添加剂为虾的生长性能和健康提供了独特的好处。特别是，复杂的益生菌和酶表现出全方位的积极影响，并显着提高了生长性能，免疫能力和抗病能力。