EFFECTS OF DIETARY ENERGY LEVEL ON GROWTH, FEED CONVERSION, BODY COMPOSITION, DIGESTIBILITY COEFFICIENTS AND ENERGY BUDGET OF NILE TILAPIA (OREOCHROMIS NILOTICUS). | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 11, Volume 3, Issue 3, June 1999, Page 159-180 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.1999.3433 | ||||
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| Authors | ||||
| El-Saidy D.; Gaber A1; Magouz I.2 | ||||
| 1National Institute of Oceanography & Fisheries, Cairo, Egypt | ||||
| 2Department of Animal Production, Kafer-El-Sheikk Agri.,Tanta Univ.,Egypt | ||||
| Abstract | ||||
| Aone way experiment was conducted with Nile tilapia, Oreochromis niloticus, using restricted feeding with 4280, 4370, 4520, 4660, 4800 and 4860 Kcal / kg diet of dietary energy concentration with isonitrogenous contant (33 % crude protein). Diets were fed to triplicate random groups of 30 fry for 84 day in glass aquaria. At a constant dietary protein level, weight gain and protein efficiency ratio increased with increasing dietary energy level. The body fat content of the experimental fish increased with the increaseing of dietary energy level. Fish fed diets E and F (4800 and 4860 Kcal/kg) had significantly higher fat content than those of fish fed all other diets. Protein productive value (PPV) of Nile tilapia given diet containing 330 g protein and 4800 kcal /kg diet was significantly higher than those of fish fed all other dietary energy levels. Dietary energy levels correlated positively with weight gain, body length, body weight, SGR and total feed intake, (r = 0.91, 0.91, 0.92, 0.92, 0.92) and negatively with feed conversion ratio (FCR) and PER (r = - 0.90 and - 0.86). The apparent digestibility coefficients for dry matter, protein and lipid were significantly affected by dietary energy levels while, digestibility of energy was not significantly affected by energy levels. The energy budget at the restricted feeding was 100 IE = 14.9 FE + 5.79 (ZE + UE) + 63.37 HE + 15.94 RE, where IE, FE, (ZE + UE), HE and RE represented gross energy intake, fecal energy, excretory energy loss, heat production and growth energy, respectively. It can be suggesed that dietary energy of 4800 Kcal GE / kg or 4000 Kcal DE / kg diet with a constant dietary protein of 33.0 % was superior to high growth rate and best food utilization of juvenile Nile tilapia under the conditions of this study. | ||||
| Keywords | ||||
| Growth; feed; body composition; Orechromis niloticus | ||||
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