Faculty of Agriculture, Department of Animal Production, Kafrelsheikh University, Kafrelsheikh, Egypt.
Agriculture Research Center, Central Laboratory for Aquaculture Research, Abbassa, Sharkia, Sakha Aquaculture Research Unit, Kafrelsheikh, Egypt.
PLoS One. 2023 Oct 5;18(10):e0291954. doi: 10.1371/journal.pone.0291954. eCollection 2023.
Soybean lecithin (SBL) is usually added to aquafeed as a lipid source because aquatic animals cannot synthesize phospholipids. Hence, this study aimed to investigate the role of SBL on the growth, nutrient consumption, digestive enzyme activity, blood parameters, and antioxidant capability of striped catfish. The fish were fed on five experimental diets with five grading levels of SBL (0, 2, 4, 6, and 8%) for 60 days. The final weight, weight gain, specific growth rate, feed intake, and protein efficiency ratio were markedly higher in striped catfish treated with 2-4% SBL than the control level (0% SBL). However, the lowest feed conversion ratio was in the fish-fed groups of 4-6% SBL. The carcass lipid content was significantly higher in fish fed 2-4% SBL compared to the control level (0% SBL). The lipase, amylase, and protease activities were significantly increased in the fish fed 2-6% SBL compared to 0% SBL-fed group. The gradually increased levels of SBL improved the structural appearance and increased the intestinal villi length and branching appearance. The triglycerides and total cholesterol were increased in the fish fed with 4, 6, and 8% compared to the control level, with the highest being in the fish fed with 8%. The lysozyme activity was higher in the fish fed with 2, 4, and 6% of SBL compared to the control level, with higher activity in the fish fed with 2 and 4% than 6%. Superoxide dismutase, glutathione peroxidase, and catalase activities were increased in the fish fed with 2, 4, and 6% SBL. The malondialdehyde level was lower in the fish fed with 4-6% SBL compared to the control level. The regression analysis revealed that the optimum dose of SBL is required at 3.65-4.42% for better productivity and health performances in striped catfish.
大豆卵磷脂（SBL）通常作为脂质源添加到水产饲料中，因为水生动物不能合成磷脂。因此，本研究旨在探讨 SBL 对条纹𬶐生长、营养物质消耗、消化酶活性、血液参数和抗氧化能力的影响。将鱼分别投喂 5 种实验饲料，其中 SBL 添加量分别为 0、2、4、6 和 8%，共 60 天。结果表明，与对照组（0% SBL）相比，摄食 2-4% SBL 的条纹𬶐的末重、增重、特定生长率、饲料摄入量和蛋白质效率比显著提高，而摄食 4-6% SBL 的鱼的饲料转化率最低。摄食 2-4% SBL 的鱼的体脂含量显著高于对照组（0% SBL）。与对照组相比，摄食 2-6% SBL 的鱼的脂肪酶、淀粉酶和蛋白酶活性显著提高。随着 SBL 水平的逐渐升高，鱼的肠道结构外观得到改善，肠绒毛长度和分支外观增加。与对照组相比，摄食 4、6 和 8% SBL 的鱼的甘油三酯和总胆固醇水平升高，其中 8% SBL 组最高。与对照组相比，摄食 2、4 和 6% SBL 的鱼的溶菌酶活性升高，其中摄食 2%和 4% SBL 的鱼的活性高于 6% SBL 组。摄食 2、4 和 6% SBL 的鱼的超氧化物歧化酶、谷胱甘肽过氧化物酶和过氧化氢酶活性升高。与对照组相比，摄食 4-6% SBL 的鱼的丙二醛水平降低。回归分析表明，条纹𬶐生产性能和健康状况的最佳 SBL 剂量为 3.65-4.42%。
