This study investigated the effects of dietary lysolecithin on growth performance, feed utilization and metabolic responses of channel catfish (Ictalurus punctatus). Fish (initial weight: 14.77 ± 0.45 g) were randomly fed one of five practical diets supplemented with graded levels of lysolecithin (0, 125, 250, 375 and 500 mg/kg) in quadruplicate groups for 10 weeks. Results showed that no significant differences in weight gain, condition factor and viscerosomatic index among all the treatments. Fish fed diet supplemented with 250 mg/kg lysolecithin had significantly decreased feed conversion ratio and significantly increased protein efficiency ratio compared to that fed the control diet. The group with 250 mg/kg of dietary lysolecithin had higher protein and lower lipid contents in the whole body, and lower lipid content in the liver than those in the control group. Groups supplemented with 250–500 mg/kg of dietary lysolecithin had significantly higher gastric and intestinal lipase activities than the control group. Dietary lysolecithin at the level of 250 mg/kg significantly increased the activities of Na⁺, K⁺‐ATPase, alkaline phosphatase, total antioxidative capacity, total superoxide dismutase, glutathione peroxidase and catalase and significantly decreased the content of malondialdehyde compared to the control diet. In conclusion, dietary supplementation of lysolecithin could confer benefits of feed utilization, body composition and antioxidative capacity of channel catfish.

中文翻译：

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日粮溶血卵磷脂对鲶鱼（Ictalurus punctatus）生长性能、饲料利用、肠道形态和代谢反应的影响

本研究调查了日粮溶血卵磷脂对沟鲶（Ictalurus punctatus）生长性能、饲料利用和代谢反应的影响。鱼（初始重量：14.77 ± 0.45 克）随机饲喂五种实际饮食中的一种，其中补充有分级水平的溶血卵磷脂（0、125、250、375 和 500 毫克/千克），一式四份，持续 10 周。结果表明，各处理间体重增加、状况因子和内脏指数均无显着差异。与饲喂对照日粮的鱼相比，添加 250 mg/kg 溶血卵磷脂的饲喂鱼饲料的饲料转化率显着降低，蛋白质效率比显着增加。膳食溶血卵磷脂250 mg/kg组的全身蛋白质含量较高，脂质含量较低，肝脏中脂质含量低于对照组。补充 250–500 mg/kg 膳食溶血卵磷脂的组比对照组具有显着更高的胃和肠脂肪酶活性。与对照饮食相比，250 mg/kg 的日粮溶血卵磷脂显着增加了 Na⁺、K⁺-ATPase、碱性磷酸酶、总抗氧化能力、总超氧化物歧化酶、谷胱甘肽过氧化物酶和过氧化氢酶的活性，并显着降低了丙二醛的含量. 总之，日粮中添加溶血卵磷脂可以提高鲶鱼的饲料利用率、身体成分和抗氧化能力。补充 250–500 mg/kg 膳食溶血卵磷脂的组比对照组具有显着更高的胃和肠脂肪酶活性。与对照饮食相比，250 mg/kg 的日粮溶血卵磷脂显着增加了 Na⁺、K⁺-ATPase、碱性磷酸酶、总抗氧化能力、总超氧化物歧化酶、谷胱甘肽过氧化物酶和过氧化氢酶的活性，并显着降低了丙二醛的含量. 总之，日粮中添加溶血卵磷脂可以提高鲶鱼的饲料利用率、身体成分和抗氧化能力。补充 250–500 mg/kg 膳食溶血卵磷脂的组比对照组具有显着更高的胃和肠脂肪酶活性。与对照饮食相比，250 mg/kg 的日粮溶血卵磷脂显着增加了 Na⁺、K⁺-ATPase、碱性磷酸酶、总抗氧化能力、总超氧化物歧化酶、谷胱甘肽过氧化物酶和过氧化氢酶的活性，并显着降低了丙二醛的含量. 总之，日粮中添加溶血卵磷脂可以提高鲶鱼的饲料利用率、身体成分和抗氧化能力。与对照饮食相比，谷胱甘肽过氧化物酶和过氧化氢酶的含量显着降低。总之，日粮中添加溶血卵磷脂可以提高鲶鱼的饲料利用率、身体成分和抗氧化能力。与对照饮食相比，谷胱甘肽过氧化物酶和过氧化氢酶的含量显着降低。总之，日粮中添加溶血卵磷脂可以提高鲶鱼的饲料利用率、身体成分和抗氧化能力。