A 63‐day experiment was done to study the effects of four levels (5, 10, 20 and 50 g/kg) of encapsulated organic salts (Na‐acetate, Na‐butyrate, Na‐lactate and Na‐propionate) on the growth indices and haemato‐immunological responses of crayfish Astacus leptodactylus leptodactylus (4.38 ± 0.08 g). Crayfish were distributed at 51 1,000‐L tanks (17 treatments at triplicate). The highest values of final weight (27.86 g), specific growth rate (2.94% body weight per day) and survival rate (96%) were observed in the crayfish fed the 20 g/kg of encapsulated Na‐propionate diet (p < .05). The highest activities of phenoloxidase (7.4 U/min), superoxide dismutase (7.80 U/min) and lysozyme (9.40 U/min) were observed in the gut of crayfish fed the 20 g/kg of encapsulated Na‐propionate diet (p < .05), as well as the highest activities of alkaline protease (10.70 U/mg), lipase (9.10 U/mg), amylase (9.60 U/mg) and the lactobacillus count (p < .05). Broken line regression model of SGR and phenoloxidase activity suggested that the optimum dietary levels of encapsulated Na‐acetate, Na‐butyrate, Na‐lactate and Na‐propionate could be 30.7, 31.8, 31.4 and 33.5 g/kg, respectively, in crayfish reared in culture conditions.

中文翻译：

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日粮封装的有机盐（乙酸钠，丁酸钠，乳酸钠和丙酸钠）对幼年窄爪小龙虾，Astacus leptodactylus leptodactylus Eschscholtz，1823年生长性能，血淋巴，抗氧化剂和消化酶活性以及肠道菌群的影响

进行了为期63天的实验，研究了四种水平（5、10、20和50 g / kg）封装的有机盐（乙酸钠，丁酸钠，乳酸钠和丙酸钠）对生长的影响小龙虾小球藻小球藻指数（4.38±0.08 g）和血液免疫学反应。小龙虾分布在51个1,000L的水箱中（一式三份，共17种处理）。喂以20克/千克胶囊化丙酸钠饮食的小龙虾的最终重量（27.86 g），比生长速率（每天2.94％每天体重）和成活率（96％）最高（p  <。 05）。饲喂20克/千克胶囊化丙酸钠日粮的小龙虾肠道中酚氧化酶（7.4 U / min），超氧化物歧化酶（7.80 U / min）和溶菌酶（9.40 U / min）的最高活性（p  <.05），以及碱性蛋白酶（10.70 U / mg），脂肪酶（9.10 U / mg），淀粉酶（9.60 U / mg）和乳杆菌计数的最高活性（p  <.05）。SGR和酚氧化酶活性的折线回归模型表明，在饲养的小龙虾中，封装的乙酸钠，丁酸钠，乳酸钠和丙酸钠的最佳日粮水平分别为30.7、31.8、31.4和33.5 g / kg。在文化条件下。