Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, Pine Bluff, AR 71601, USA.
J Sci Food Agric. 2013 Apr;93(6):1365-9. doi: 10.1002/jsfa.5898. Epub 2012 Oct 2.
Traditional energy sources in catfish diets have become costly, and economical alternatives are needed. Sweet potato leaves are underutilised agricultural by-products that provide energy and substantial amounts of phenols, which affect animal and human health. There is little information on the effects of these compounds on catfish, or the capacity of catfish to accumulate dietary phenols. Catfish enriched with phenols have marketing potential as functional foods. This study investigated the effects of diets with sweet potato leaf meal (SPLM) on growth performance, health and total phenolic compounds in catfish.
SPLM was substituted for wheat middlings in three diets fed to groups of juvenile catfish for 10 weeks. Weight gain, feed conversion, survival, alternative complement activity and lysozyme activity were similar among diets. Haematocrit was lower in fish fed diets with SPLM, but within the normal range. Total phenols and antioxidant capacity in the whole body were similar among treatments.
SPLM was an effective energy source for catfish up to the maximum level tested (230 g kg(-1) diet). SPLM did not enhance total phenols in catfish, but there were no apparent antinutritional effects of the meal on catfish growth, health or survival.
鲶鱼饲料中的传统能源变得昂贵，需要经济的替代品。甘薯叶是未充分利用的农业副产品，提供能量和大量的酚类物质，影响动物和人类健康。关于这些化合物对鲶鱼的影响，或鲶鱼积累饮食酚类物质的能力，信息很少。富含酚类的鲶鱼作为功能性食品具有市场潜力。本研究探讨了用甘薯叶粉（SPLM）替代三种饲料中麦麸对幼鲶鱼生长性能、健康和总酚类化合物的影响。
在 10 周的时间里，将 SPLM 替代三种饲料中的麦麸喂养幼鲶鱼。各组的体重增加、饲料转化率、成活率、替代补体活性和溶菌酶活性相似。摄食 SPLM 饲料的鱼的血细胞比容较低，但在正常范围内。各处理组的全身总酚类物质和抗氧化能力相似。
SPLM 是鲶鱼的有效能量来源，最高用量可达试验最大值（饲料 230 克/千克）。SPLM 并未提高鲶鱼的总酚含量，但该饲料对鲶鱼的生长、健康或成活率没有明显的抗营养作用。
