Evaluation of some feed additives at different levels in diet of Nile tilapia (Oreochromis niloticus) [electronic resource].

Includes references.

This study was carried out in order to estimate the infiuence of three levels of dried yeast, two kinds of probiotics (Bacillozyme and Bacillogene) and vitamin Con growth performance, feed utilization, blood parameters, hepatic and renal histopathology, chemical composition of the whole fish and economic feed efficiency of Nile Tiiapia (O. niloticus) fingeriings. Total numbers of 390 of Nile Tilapia fingerlings with intial weight of 17.41 gram were divided into four treatment groups and control group. Each treatement group was divided into three sub-groups in three replicates each (39 aquaria). Each aquarium were contained 10 fish. Different types of additives. were added to abasal diet (22% CP) at three leveis each including dried yeast (10, 15 and 20 g/kg diet); probiotics (Bacillozym and Bacillogene), 1, 2 and 3 g/kg diet from each probiotic and vitamin C (500, 1500 and 2000 mg/kg diet. The best growth performance and feed utilization without any pathologicai signs in iiver and kidney, normal blood parameters and chemical composition of meat and the best economic efficiency were obtained with bacillozyme at level three grams/kg diet. Dried yeast at level of 20 g/kg diet showed significantly better results than the control group. The lowest results were obtained with the highest ievel of vitamin c (2000 ppm/kg).

Summary in Arabic.

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