Kishawy Asmaa T Y, Sewid Alaa H, Nada Hend S, Kamel Mohamed A, El-Mandrawy Shefaa A M, Abdelhakim Taghrid M N, El-Murr Abd Elhakeem I, Nahhas Nihal El, Hozzein Wael N, Ibrahim Doaa
Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate 44519, Egypt.
Departments of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate 44519, Egypt.
Animals (Basel). 2020 Sep 23;10(10):1724. doi: 10.3390/ani10101724.
The aim of the present study was to evaluate mannan oligosaccharides (MOS) or glycerol (GLY) as a carbon source on biofloc systems of Nile tilapia ( juveniles. Fish ( = 750) were reared in open flow (Controls) or biofloc systems (B-GLY and B-MOS) fed with a plant or fish protein source over a period of twelve weeks. Total ammonia nitrogen and nitrate decreased in the biofloc groups, while biofloc volume increased in B-MOS. Compared to the controls, B-MOS and B-GLY exhibited higher weight gain and improved feed conversion, irrespectively of the diet. Serum level of C-reactive protein was reduced, while IgM and lysozyme activity was higher in the B-MOS fish, compared to other groups. Intestinal spp. count was increased, whereas and spp. counts decreased in B-MOS reared groups, compared to the other groups. The proinflammatory cytokine (IL-8 and IFN-γ) transcript expression was upregulated in B-MOS more than B-GLY reared groups. Compared to the controls, the virulence of was decreased in the B-MOS and B-GLY groups. The results indicate several benefits of using MOS as a carbon source in a biofloc Nile tilapia system; a cost benefit analysis is required to assess the economic viability of this.
本研究的目的是评估甘露寡糖（MOS）或甘油（GLY）作为尼罗罗非鱼幼鱼生物絮团系统碳源的效果。750尾鱼分别饲养在开放式流水系统（对照组）或生物絮团系统（B - GLY和B - MOS）中，投喂植物或鱼蛋白源饲料，为期12周。生物絮团组的总氨氮和硝酸盐含量降低，而B - MOS组的生物絮团体积增加。与对照组相比，B - MOS和B - GLY组无论饲喂何种饲料，均表现出更高的体重增加和更好的饲料转化率。与其他组相比，B - MOS组鱼的血清C反应蛋白水平降低，而IgM和溶菌酶活性更高。与其他组相比，B - MOS饲养组的肠道菌数量增加，而和菌数量减少。与B - GLY饲养组相比，B - MOS组促炎细胞因子（IL - 8和IFN - γ）的转录表达上调。与对照组相比，B - MOS和B - GLY组的毒力降低。结果表明在尼罗罗非鱼生物絮团系统中使用MOS作为碳源有诸多益处；对此需要进行成本效益分析以评估其经济可行性。
