Abstract Porcine solubles, originating from porcine mucosal tissues, is a by-product of heparin production. The nutritional value and functionality of a carrier-free, spray-dried porcine soluble (DPS) product was evaluated in 56-day experiment with juvenile rice field eel Monopterus albus (initial weight: 15.5 ± 0.19 g) fed diets with optimal (42%) and a low level (22%) of fishmeal (FM) inclusion. Six isonitrogenous and isolipidic experimental diets were formulated with two levels of FM (22% and 42%) and three levels of DPS (0%, 2.5% and 5%). Growth performance, humoral immunity, digestive enzyme activities, intestinal histology and expression of intestinal tight junction protein-related mRNA were analyzed at the end of the trial. Similar to FM, inclusion of 5% DPS significantly enhanced growth rate and reduced feed conversion ratio of rice field eel, although no significant interaction between FM and DPS on growth performance were observed. Positive influences of DPS on fish health and immunity were seen in that inclusion of DPS significantly enhanced serum complement (C3, C4), immunoglobulin M (IgM) levels and lysozyme activities, and altered total cholesterol and triglyeride contents in the serum of rice field eel. In regard to gut health, villus height, goblet cell quantity and expression of ZO-1 transcripts significantly (P

中文翻译：

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稻鳗（Monopterus albus）日粮中猪干可溶物的评价

摘要 猪可溶物来源于猪黏膜组织，是生产肝素的副产品。无载体喷雾干燥猪可溶性 (DPS) 产品的营养价值和功能在 56 天的实验中用最佳 (42%) 喂养的稻田鳗鲦鱼幼鱼（初始重量：15.5 ± 0.19 克）进行评估。 ) 和低水平 (22%) 的鱼粉 (FM) 含量。六种异氮和等脂实验日粮配制有两种水平的 FM（22% 和 42%）和三种水平的 DPS（0%、2.5% 和 5%）。在试验结束时分析生长性能、体液免疫、消化酶活性、肠道组织学和肠道紧密连接蛋白相关mRNA的表达。类似于 FM，加入 5% DPS 可显着提高稻鳗的生长速度并降低饲料转化率，但未观察到 FM 和 DPS 之间对生长性能的显着相互作用。DPS 对鱼类健康和免疫的积极影响包括 DPS 的加入显着提高了稻鳗血清中的血清补体（C3、C4）、免疫球蛋白 M（IgM）水平和溶菌酶活性，并改变了总胆固醇和甘油三酯含量. 在肠道健康方面，绒毛高度、杯状细胞数量和 ZO-1 转录本的表达显着（P 免疫球蛋白 M (IgM) 水平和溶菌酶活性，并改变了稻鳗血清中的总胆固醇和甘油三酯含量。在肠道健康方面，绒毛高度、杯状细胞数量和 ZO-1 转录本的表达显着（P 免疫球蛋白 M (IgM) 水平和溶菌酶活性，并改变了稻鳗血清中的总胆固醇和甘油三酯含量。在肠道健康方面，绒毛高度、杯状细胞数量和 ZO-1 转录本的表达显着（P