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Dietary microbial phytase and citric acid synergistically enhances nutrient digestibility and growth performance of Labeo rohita (Hamilton) juveniles at sub-optimal protein level
Authors:Kartik Baruah  Narottam P Sahu  Asim K Pal  Kamal K Jain  Dipesh Debnath  & Subhas C Mukherjee
Institution:Laboratory for Aquaculture and Artemia Reference Center, Faculty of Bioscience Engineering. Department of Animal Production, Ghent University, Gent, Belgium; Division of Fish Nutrition and Biochemistry, Central Institute of Fisheries Education, Fisheries University Road, Mumbai, India; Department of Fish Pathology and Microbiology, Central Institute of Fisheries Education, Fisheries University Road, Mumbai, India
Abstract:A 2 × 2 × 2 factorial experiment was designed to study the main effect of dietary microbial phytase, citric acid, crude protein (CP) level and their interactions on growth performance, nutrient digestibility and body composition of Labeo rohita juveniles. Two basal diets were formulated using plant‐based ingredients containing either sub‐optimum (25%) or normal (35%) CP levels. Both the diets were supplemented with microbial phytase (U kg?1) and citric acid (%) at the level of 0, 0; 500, 0; 0, 3; and 500, 3 respectively. One hundred and twenty L. rohita juveniles (average weight 12.61–13.72 g) were randomly distributed in eight treatments, each with three replicates. Dietary microbial phytase alone had no significant effect on whole‐body ash content but addition of citric acid (3%) in the diet activated the phytase as evidenced by their significant interaction. A significant interaction between citric acid and microbial phytase was also found on weight gain%, specific growth rate, protein efficiency ratio. Increasing the dietary CP level from 25% to 35% significantly (P<0.01) decreased phosphorus and dry matter digestibility. Thus, these results showed that the growth‐promoting effect was higher in groups fed a sub‐optimum protein (25%) diet containing both 3% citric acid and 500 U kg?1 of microbial phytase than those fed 35% CP diets. This suggests that microbial phytase and citric acid in sub‐optimum CP diet had a synergistic effect on nutrient digestibility and growth performance of L. rohita juveniles.
Keywords:microbial phytase  citric acid  protein              Labeo rohita            body composition growth  nutrient digestibility  plant protein
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