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<p>A 60-day feeding trial was accomplished, whereas four exogenous enzymes (including phytase, cellulase, xylanase, and β-gluconase) were top-sprayed onto high plant protein diet (HPPD) to evaluate their effects on growth performance and liver and gut health of Nile tilapia. Five test diets (defined as HPPD, HPPD-phytase, HPPD-cellulase, HPPD-xylanase, and HPPD-gluconase) were formulated. At the end of the feeding trial, improvement in growth performance (final weight and specific growth rate) resulted from the increased feed utilization (feed intake and feed conversion ration) and protein efficiency ratio was noticed in exogenous enzymes–supplemented diets. All enzymes induced significant improvements in the anterior, middle, and posterior gut barrier function (villus height and muscularis thickness). In addition, the digestive enzyme activities including protease and lipase improved significantly in fish fed HPPD-exogenous enzymes diets, while amylase activity significantly increased in fish fed xylanase- and gluconase-supplemented HPPD diets when compared with HPPD-based diet. Phytase, xylanase, and β-gluconase supplementation attenuated HPPD-induced histopathological changes in the liver whereas cellulase enzyme was not able to improve HPPD-altered liver health. All enzymes stimulated the expression of growth hormone (<i>GHR1</i> and <i>GHR2</i>) and growth-relevant (<i>IGF-1</i> and <i>IGF-2</i>) genes. To sum up, exogenous enzymes could be used as functional feed additives to ameliorate the quality of plant proteins and counteract HPPD-induced negative repercussions on the health of cultured fish.</p>

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Advantageous roles of top-sprayed exogenous enzymes on growth, liver and gut functions, and growth-related genes in Nile tilapia fed a high plant protein diet

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Md Reaz Chaklader,
  • Hamada A. Ahmed,
  • Ali A. Soliman,
  • Mahmoud S. Gewaily,
  • Asem A. Amer,
  • Mustafa Shukry,
  • Hany M. R. Abdel-Latif

摘要

A 60-day feeding trial was accomplished, whereas four exogenous enzymes (including phytase, cellulase, xylanase, and β-gluconase) were top-sprayed onto high plant protein diet (HPPD) to evaluate their effects on growth performance and liver and gut health of Nile tilapia. Five test diets (defined as HPPD, HPPD-phytase, HPPD-cellulase, HPPD-xylanase, and HPPD-gluconase) were formulated. At the end of the feeding trial, improvement in growth performance (final weight and specific growth rate) resulted from the increased feed utilization (feed intake and feed conversion ration) and protein efficiency ratio was noticed in exogenous enzymes–supplemented diets. All enzymes induced significant improvements in the anterior, middle, and posterior gut barrier function (villus height and muscularis thickness). In addition, the digestive enzyme activities including protease and lipase improved significantly in fish fed HPPD-exogenous enzymes diets, while amylase activity significantly increased in fish fed xylanase- and gluconase-supplemented HPPD diets when compared with HPPD-based diet. Phytase, xylanase, and β-gluconase supplementation attenuated HPPD-induced histopathological changes in the liver whereas cellulase enzyme was not able to improve HPPD-altered liver health. All enzymes stimulated the expression of growth hormone (GHR1 and GHR2) and growth-relevant (IGF-1 and IGF-2) genes. To sum up, exogenous enzymes could be used as functional feed additives to ameliorate the quality of plant proteins and counteract HPPD-induced negative repercussions on the health of cultured fish.