Journal
AQUACULTURE NUTRITION
Volume 27, Issue 4, Pages 1009-1018Publisher
WILEY-HINDAWI
DOI: 10.1111/anu.13242
Keywords
carcass composition; fingerling Oreochromis niloticus; growth; requirement; Total aromatic amino acid
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Funding
- Sudan University of Science Technology
- Ministry of Higher Education and Scientific Research, Sudan
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This study determined the dietary total aromatic amino acid requirement and tyrosine replacement value for phenylalanine in fingerling Oreochromis niloticus. The results showed that the phenylalanine requirement was 12.1 g/kg dry diet, the tyrosine requirement was 8.5 g/kg dry diet, and the total aromatic amino acid requirement was 20.6 g/kg dry diet.
This study was conducted to determine the dietary total aromatic amino acid requirement and tyrosine replacement value for phenylalanine for fingerling Oreochromis niloticus by conducting two 8-week experiments. In experiment I, phenylalanine requirement was determined by feeding test diets (350 g kg(-1) CP; 16.72 kJ g(-1) GE) with graded levels of phenylalanine (4, 6.5, 9, 11.5, 14 and 16.5 g kg(-1) dry diet) at a constant level (10 g kg(-1)) of dietary tyrosine to triplicate groups of fish (1.65 +/- 0.09 g). Quadratic analyses of absolute weight gain (AWG), protein deposition (PD%) and phenylalanine retention efficiency (PRE%) indicated the requirement at 12.1 g kg(-1) dry diet. In experiment II, six diets with different levels of L-tyrosine (2.0, 4.0, 6.0, 8.0, 10.0 and 12.0 g kg(-1) dry diet) with 12.1 g kg(-1) phenylalanine as determined in experiment I fixed in all the test diets were fed to fish (1.67 +/- 0.17 g) to determine the tyrosine requirement under same conditions. Quadratic regression analysis of AWG, PD and PRE demonstrated the tyrosine requirement at 8.5 g kg(-1) dry diet, corresponding to 24.2 g kg(-1) of dietary protein. Based on the above data, the total aromatic amino acid requirement was found to be 20.6 g kg(-1) of dry diet, corresponding to 58.8 g kg(-1) of dietary protein, and tyrosine replacement value for phenylalanine was found to be 37% on a molar basis.
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