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Improved performance of a rainbow trout selected strain is associated with protein digestion rates and synchronization of amino acid absorption
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Improved performance of a rainbow trout selected strain is associated with protein digestion rates and synchronization of amino acid absorption
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Journal Article
Improved performance of a rainbow trout selected strain is associated with protein digestion rates and synchronization of amino acid absorption
2020
Overview
Replacement of fishmeal in feeds is critical for sustainable aquaculture growth. However, replacement with plant protein concentrates reduces fish performance. A rainbow trout strain selected for high performance on a plant protein diet was compared to a non-selected strain to identify physiological mechanisms associated with improved performance. Nutrient digestibility in fishmeal and plant protein diets was assessed and no strain differences were found. Levels of amino acids in the hepatic portal vein and caudal vein were measured at intervals after a single force-feeding of fishmeal, four plant protein concentrates, and a mixture of the concentrates with or without supplementation of three limiting amino acids. Each ingredient affected plasma amino acid levels in a singular manner when fed individually but without predictable additive effects when fed as a mixture. Amino acid supplementation altered uptake and plasma concentrations of all the essential amino acids. The selected trout strain fed the plant protein mixture with amino acids showed a synchronous and homogenous pattern for essential amino acids over time in the hepatic portal vein in contrast to that of the non-selected strain. The results demonstrate that selection favorably altered temporal dynamics of plant protein digestion.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
