Addressing the shortage of high-quality protein resources, this study was conducted to investigate the effects of replacing soybean meal (SBM) with different levels of enzymolysis-fermentation compound protein feed (EFCP) in the diets of growing-finishing pigs, focusing on growth performance, nutrients digestibility, carcass traits, and meat quality. Sixty DLY (Duroc × Landrace × Yorkshire) pigs with an initial body weight of 42.76 ± 2.05 kg were assigned to 5 dietary treatments in a 2 × 2 + 1 factorial design. These dietary treatments included a corn-soybean meal diet (CON), untreated compound protein feed (UCP) substitution 50% (U50) and 100% SBM (U100) diets, and EFCP substitution 50% (EF50) and 100% SBM (EF100) diets. Each treatment had 6 pens (replicates) with 2 pigs per pen, and the experiment lasted 58 d, divided into phase I (1–28 d) and phase II (29–58 d). Following phase I, only the CON, U50, and EF50 groups were continued for phase II, each with 5 replicate pens. On d 59, a total of 15 pigs (1 pig/pen, 5 pens/treatment) were euthanized. During phase I, the EF50 group had a higher average daily gain (ADG) in pigs (P < 0.05) compared to the CON group, whereas the U50 group did not have a significant difference. As the substitution ratio of UCP and EFCP increased in phase I, there was a noticeable reduction in the final body weight and ADG (P < 0.05), along with an increase in the feed-to-gain ratio (F/G) (P < 0.05). In phase II, there were no significant differences in growth performance among the treatment groups, but EF50 increased the apparent digestibility of several nutrients (including dry matter, crude protein, crude fiber, acid detergent fiber, ash, gross energy) compared to U50. The EF50 group also exhibited significantly higher serum levels of neuropeptide Y and ghrelin compared to the CON and U50 groups (P < 0.05). Moreover, the EF50 group had higher carcass weight and carcass length than those in the CON and U50 groups (P < 0.05), with no significant difference in meat quality. The study findings suggest that replacing 50% SBM with EFCP during the growing-finishing period can improve the growth performance, nutrient digestibility, and carcass traits of pigs without compromising meat quality. This research offers valuable insights into the modification of unconventional plant protein meals and developing alternatives to SBM.

中文翻译：

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酶解发酵复合蛋白饲料替代豆粕对生长肥育猪生长性能、营养物质表观消化率、胴体性状及肉品质的影响


本研究针对优质蛋白质资源短缺的问题，探讨不同水平酶解发酵复合蛋白饲料（EFCP）替代豆粕（SBM）在生长肥育猪日粮中的应用效果，重点关注生长发育。性能、营养物质消化率、胴体性状和肉质。将 60 头初始体重为 42.76 ± 2.05 kg 的 DLY（杜洛克 × 长白 × 约克夏）猪按照 2 × 2 + 1 析因设计分配至 5 种日粮处理组。这些日粮治疗包括玉米-豆粕日粮 (CON)、未经处理的复合蛋白饲料 (UCP) 替代 50% (U50) 和 100% SBM (U100) 日粮以及 EFCP 替代 50% (EF50) 和 100% SBM (EF100) ）饮食。每个处理6栏（重复），每栏2头猪，实验持续58 d，分为I期（1~28 d）和II期（29~58 d）。第一阶段之后，只有 CON、U50 和 EF50 组继续进入第二阶段，每个组有 5 个重复栏。第 59 天，总共 15 头猪（1 头猪/栏，5 栏/处理）被安乐死。在第一阶段，与 CON 组相比，EF50 组猪的平均日增重 (ADG) 较高 (P < 0.05)，而 U50 组没有显着差异。随着第一阶段 UCP 和 EFCP 替代率的增加，最终体重和日增重 (ADG) 显着降低 (P < 0.05)，同时料增比 (F/G) 增加 ( P< 0.05）。在第二阶段，处理组之间的生长性能没有显着差异，但与 U50 相比，EF50 提高了几种营养素（包括干物质、粗蛋白、粗纤维、酸性洗涤纤维、灰分、总能量）的表观消化率。 与 CON 和 U50 组相比，EF50 组还表现出显着较高的神经肽 Y 和生长素释放肽血清水平 (P < 0.05)。此外，EF50组的胴体重量和胴体长度高于CON和U50组（P<<0.05），但肉品质无显着差异。研究结果表明，在生长肥育期用EFCP替代50%SBM可以改善猪的生长性能、养分消化率和胴体性状，且不会影响肉质。这项研究为非常规植物蛋白粉的改性和开发 SBM 替代品提供了宝贵的见解。