Effect of dietary protein and energy level on growth, protein utilization and carcass composition of rabbitfish, Siganus guttatus
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Six semipurified diets comprising three levels of protein (25, 35, 45% of dry matter) each at two levels of estimated energy (3161, 3832 kcal/kg) were fed to fry for 8 weeks in 250-l tanks at a stocking density of 80 fish/tank. Growth increased with increasing dietary protein (P<0.01) and energy (P<0.05). Within isocaloric diets, a positive correlation was found between growth and dietary protein-to-energy (P⁄E) ratio (P<0.05). Protein productive value (PPV) and protein efficiency ratio (PER) were negatively correlated with dietary P⁄E ratio. The equations describing this trend were: PPV=50.16−0.19X and PER=2.83−0.12X, where X is P⁄E. Based on responses for growth rate and efficiency of protein utilization, a diet with 35% protein and 3832 kcal/kg energy was found to be best for rabbitfish fry. Carcass fat levels increased in those fish fed diets with 3832 kcal/kg energy. Carcass protein and ash percentages remained essentially constant and independent of dietary treatment.
Suggested CitationParazo, M. M. (1990). Effect of dietary protein and energy level on growth, protein utilization and carcass composition of rabbitfish, Siganus guttatus.
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