提高罗氏沼虾雌虾繁殖和抗氧化性能饲料添加剂比较研究

COMPARATIVE STUDY ON FEED ADDITIVES FOR ENHANCING REPRODUCTIVE PERFORMANCE AND ANTIOXIDANT CAPACITY OF FEMALE MACROBRACHIUM ROSENBERGII

  • 摘要: 本研究旨在探究提高罗氏沼虾(Macrobrachium rosenbergii)雌虾繁殖和抗氧化性能的营养学策略, 为罗氏沼虾人工繁育提供数据支持。以商品日粮(36%蛋白、7.9%脂肪)为对照组(CT), 并在此基础上分别添加大豆卵磷脂(LE)、花生四烯酸(AA)、虾青素(AS)、大豆卵磷脂+花生四烯酸+虾青素复合物(LE+AA+AS)、复合维生素和矿物质(AM), 配制成6组实验日粮饲喂雌性罗氏沼虾, 进行为期8周的营养强化。在营养强化结束后, 比较分析了不同饲料组罗氏沼虾的肝胰腺指数、性腺指数、产卵率和相对卵重等指标, 以及亲虾血淋巴生化组成、抗氧化能力及性腺发育相关基因表达水平的变化。结果显示, 在繁殖性能方面, AA、AS和LE+AA+AS组雌虾的肝胰腺指数显著提高(P<0.05), AS和LE+AA+AS组COXCRQVTGPK基因表达量显著上调(P<0.05), 且AM组VTG基因表达量也显著上调(P<0.05); 在抗氧化方面, AS组和LE+AA+AS组分别表现为血淋巴中ASA与iNOS活性的上升, 以及肝胰腺中toll、Dorsal、RelishIMD基因表达量的显著上调(P<0.05)。研究表明, 虾青素在促进罗氏沼虾亲虾繁殖及提升抗氧化性能上效果最好, 适量复合维生素和矿物质的额外添加则有利于其卵黄的形成, 花生四烯酸、复合维生素和矿物质均有利于繁殖期亲虾的脂质营养储备与动员, 且花生四烯酸的抗氧化效果较好。

     

    Abstract: This study aimed to explore nutritional strategies for improving the reproductive performance and antioxidant capacity of female Macrobrachium rosenbergii, providing data support for the artificial breeding of this species. The commercial diet (CT, 36% protein, 7.9% fat) was used as the control group, with five experimental diets formulated by adding soybean lecithin (LE), arachidonic acid (AA), astaxanthin (AS), soybean lecithin+arachidonic acid+astaxanthin complex (LE+AA+AS), and compound vitamins and minerals (AM), respectively. These diets were fed to female M. rosenbergii for 8 weeks. After nutritional enrichment, the hepatopancreas index, gonadosomatic index, spawning rate, and relative egg weight of shrimp in different diet groups were compared, as well as the changes of hemolymph biochemical composition, antioxidant capacity, and gonad development-related gene expression level of broodstock. The results showed that: in terms of reproductive performance, the hepatopancreas index of female shrimp in AA, AS, and LE+AA+AS groups was significantly higher (P<0.05), while serum creatinine (CREA) levels in AS group and LE+AA+AS group was significantly lower (P<0.05). In addition to the LE group, the hemolymph alanine aminotransferase (ALT) content was significantly reduced in all additive group (P<0.05), and the AA group exhibited significantly higher hemolymph albumin (ALB), triacylglycerol (TG), and Total cholesterol (TC) contents (P<0.05). Expression levels of Cyclooxygenase (COX), Croquetprotein (CRQ), vitellogenin (VTG), and Pyrokinins (PK) genes were significantly up-regulated in the AS and LE+AA+AS groups (P<0.05), and VTG expression was also significantly up-regulated in the AM group (P<0.05). In terms of antioxidant capacity, the AS and LE+AA+AS groups showed an increase in ASA and iNOS activity in the hemolymph, and a significant increase in the expression of toll, Dorsal, Relish, and IMD genes in the hepatopancreas (P<0.05). The results showed that astaxanthin had the strongest effect on promoting reproductive performance and antioxidant capacity in M. rosenbergii broodstock. Adding an appropriate amount of compound vitamins and minerals benefited yolk formation. Arachidonic acid, compound vitamins and minerals supported lipid nutrient reserve and mobilization of broodstock during breeding period, and arachidonic acid also exerting a better antioxidant effect.

     

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