The objective of this study was to evaluate hydrolysis lignin (H‐lignin), derived from wood biomass, as a multifunctional component of aquafeeds. Atlantic salmon (28.8 ± 1.1 g) were fed diets for 16 weeks, which included two H‐lignin types (HL1 and HL2) at 15, 30 or 50 g/kg (wt/wt) or a control diet (no added H‐lignin). HL1 was extracted with water such that no soluble sugar and oligosaccharides remain, while HL2 contains a higher fraction of water‐soluble sugars and oligosaccharides. Pellet durability and density were measured. After 16 weeks, salmon were measured for weight and length, and whole carcass, hindgut and digesta contents were sampled. Pellet durability increased from the control to 30 g/kg H‐lignin but decreased at 50 g/kg. Salmon fed diets with HL1 at 15 and 30 g/kg showed higher weight gain and lower feed conversion ratio compared with salmon fed the control diet and 50 g/kg HL1. There were no significant differences in whole‐body composition or intestinal morphology. Microbial characterization (16S) revealed lower abundance of Proteobacteria, higher abundance of Mycoplasmataceae and increasing Lactobacillaceae abundance with higher HL1 inclusion. This study demonstrates that HL1 (at 15 and 30 g/kg) shows potential as a functional feed additive for salmon.

中文翻译：

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水解木质素作为大西洋鲑鱼饲料中的多功能添加剂，可改善鱼的生长性能和颗粒质量，并改变肠道微生物组

这项研究的目的是评估源自木材生物质的水解木质素（H-木质素），将其作为水产饲料的多功能成分。大西洋鲑（28.8±1.1 g）的饮食为期16周，其中包括15、30或50 g / kg（wt / wt）的两种H-木质素类型（HL1和HL2）或对照饮食（不添加H-木质素）。用水提取HL1，以使没有残留的可溶性糖和寡糖，而HL2包含较高比例的水溶性糖和寡糖。测量颗粒的耐久性和密度。16周后，测量鲑鱼的体重和长度，并取样整个whole体，后肠和消化物。颗粒耐久性从对照组提高到30 g / kg H-木质素，但在50 g / kg时降低。与饲喂对照饮食和50 g / kg HL1的鲑鱼相比，饲喂HL1为15和30 g / kg的鲑鱼的饲粮显示出更高的增重和较低的饲料转化率。全身组成或肠道形态无明显差异。微生物特征分析（16S）显示出变形杆菌的丰度较低，支原体科的丰度较高，乳酸菌科的丰度较高，其中HL1含量较高。这项研究表明，HL1（15和30 g / kg）显示出作为鲑鱼功能性饲料添加剂的潜力。HL1含量较高时，支原体科的丰度较高，乳杆菌科的丰度较高。这项研究表明，HL1（15和30 g / kg）显示出作为鲑鱼功能性饲料添加剂的潜力。HL1含量较高时，支原体科的丰度较高，乳杆菌科的丰度较高。这项研究表明，HL1（15和30 g / kg）显示出作为鲑鱼功能性饲料添加剂的潜力。