الفهرس 
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Abstract
The present study was carried out in three experiments at Fish Research
Center and Nutrition and Clinical Nutrition Department, Faculty of Veterinary
Medicine, Zagazig University, to investigate :-
I- The effect of adding Distiller’s Dried Grains with Solubls (DDGS) as
replacement for soybean meal and yellow corn with and without addition
of ginseng (phytoadditive) in the diet of Nile tilapia fingerlings on
(growth performance, body composition, nutrient digestibility, economic
efficiency and some immunological and blood biochemical parameters).
2- The effect of dietary supplement with natural immunostimulants such as
propolis extract (bee glue) and olive leaves extract in the diet of Nile
tilapia fingerlings on (growth performance, body composition, nutrient
digestibility, economic efficiency and some immunological and blood
biochemical parameters).
3- The effect of dietary supplement with natural growth promoters as
combination of essential oils mix and prebiotics and combination of
synbiotic and phycophytic substance in compare with antibiotic
(Oxytetracyline) in the diet of Nile tilapia fingerlings on (growth
performance, body composition, nutrient digestibility, economic
efficiency and some immunological and blood biochemical parameters).
5.1. Experiment 1:-
This experiment was designed to evaluate the effect of adding
Distiller’s Dried Grains with Soluble, DDGS (20% and 30%) as replacement
10 soybean meal and yellow corn with and without addition of ginseng, (0.1 %,
lg/kg) as phytoadditives on growth performance, nutrient digestibility, some
immunological parameters and economic efficiency A total of 360 Nile
tilapia fingerlings with initial body weight of 18.55 ±O.91 g (mean ±SD) were