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Effect of protein to energy ratio in purified diets on growth performance, feed utilization and body composition of Mozambique tilapia, Oreochromis mossambicus (Peters)
Author(s) -
ElDahhar A A,
Lovell R T
Publication year - 1995
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1995.tb00935.x
Subject(s) - feed conversion ratio , oreochromis mossambicus , tilapia , protein efficiency ratio , biology , zoology , weight gain , factorial experiment , composition (language) , dietary protein , food science , body weight , fish <actinopterygii> , fishery , endocrinology , linguistics , statistics , philosophy , mathematics
A 3 × 3 factorial experiment was conducted with Mozambique tilapia. Oreochromis mossambicus (Peters), using satiate feeding with 25%, 30% or 35% dietary protein concentrations each with three energy concentrations 10.5,12.6 or 14.7 kJ per g of purified diets. Protein‐to‐energy ratios (P/DE ratio) ranged from 17 to 33.4 mg protein kJ −1 of digestible energy (DE). Diets were fed to triplicate random groups of 15 fingerlings for 62 days in glass aquaria. Improvement in both weight gain and feed conversion rate (FCR) was achieved when dietary protein increased ( P < 0.05), while increasing dietary energy concentration reduced feed consumption and increased mortality ( P < 0.05). Protein efficiency ratio (PER) increased as dietary protein decreased and as dietary energy increased ( P < 0.05). P/DE ratio correlated positively with gain, energy retention (ER) and feed consumption ( r = 0.96,0.96 and 0.73 respectively) and negatively with feed conversion rate (FCR), protein productive value (PPV), protein efficiency ratio (PER) and mortality ( r = ‐0.93, ‐0.95. ‐0.91 and ‐0.84 respectively). Weight gain had a positive relation with feed consumption ( r = 0.82). The optimum P/DE ratio in purified diets for Mozambique tilapia for rapid growth, efficient feed conversion and maximum retention of protein and energy appears to be approximately 23.8 mg of protein kJ −1 of DE.