This study aimed to examine the effects of dietary digested soybean protein (DSP) and taurine on bile acid (BA) level, lipase activity, lipid apparent digestibility coefficient (ADC), and growth performance of pompano (Trachinotus blochii). Five diets were formulated with fish meal (FM), defatted soybean meal (SBM), and the DSP as main dietary protein sources. The diets were denoted as follows: FMD (FM-based diet), SBMD (SBM-based diet), SBM+TD (SBM-based diet plus taurine), DSPD (DSP-based diet), and DSP+TD (DSP-based diet plus taurine). Fingerling pompano with an initial body weight (BW) of 21.4 g were stocked in 500-L tanks, with triplicate tanks per dietary treatment. For 8 weeks, the fish were hand-fed the experimental diets to apparent satiation twice daily. The results showed that the DSPD and DSP+TD groups had significantly higher final BW, weight gain, and specific growth rate, but lower feed conversion ratio, than the SBMD and SBM+TD groups, respectively (P < 0.05). There were no significant differences in growth and feed performances between fish fed DSP+TD and FMD. The gallbladder and anterior intestinal BA levels, anterior intestinal lipase activity, and lipid and protein ADCs were markedly increased in fish fed DSPD and DSP+TD compared to those fed SBMD (P < 0.05), and no significant differences were detected between the DSP+TD and FMD groups. The findings of the present study suggested that dietary DSP inclusion with taurine supplementation might effectively improve lipid digestion and this contributed to growth enhancement in pompano fed a soybean protein–based diet.

本研究旨在检验膳食消化大豆蛋白（DSP）和牛磺酸对胆汁酸（BA）的水平，脂肪酶活性，脂质表观消化率系数（ADC），以及鲳的生长性能的影响（鲳blochii）。以鱼粉 (FM)、脱脂豆粕 (SBM) 和 DSP 作为主要膳食蛋白质来源配制了五种日粮。饮食表示如下：FMD（基于 FM 的饮食）、SBMD（基于 SBM 的饮食）、SBM+TD（基于 SBM 的饮食加牛磺酸）、DSPD（基于 DSP 的饮食）和 DSP+TD（基于 DSP-基于饮食加牛磺酸）。初始体重 (BW) 为 21.4 克的鲳鱼鱼种被放养在 500 升的水箱中，每个日粮处理三次。8 周内，每天两次手工喂鱼以达到明显的饱腹感。结果表明，DSPD组和DSP+TD组的最终体重、增重和比生长率均显着高于SBMD组和SBM+TD组，但饲料转化率较低（P <0.05）。饲喂DSP+TD和FMD的鱼在生长和饲料性能方面没有显着差异。与饲喂SBMD的鱼相比，饲喂DSPD和DSP+TD的鱼的胆囊和前肠BA水平、前肠脂肪酶活性以及脂质和蛋白质ADC显着增加（P < 0.05），DSP+之间没有检测到显着差异TD 和 FMD 组。本研究的结果表明，添加牛磺酸的日粮 DSP 可能有效改善脂质消化，这有助于以大豆蛋白为基础的日粮喂养的鲳鱼的生长增强。