الفهرس 
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Abstract
This study was carried out to investigate the effect of adding citric acid as feed supplementation with different levels of 0.3, 0.6 and 0.9% respectively to Japanese quail diet. A total number of 300 unsexed, one day old growing Japanese quail were randomly distributed into four experimental groups of 75 birds. Each group contains three replicates of 25 birds. The birds were housed in battery cages. Feed and water were offered to the birds ad-libitum during the experimental periods. The sequence of the four dietary treatments was as follow:-1- Basal diet (without feed additives). 2- Basal diet plus 0.3% citric acid. 3- Basal diet plus 0.6% citric acid.
4- Basal diet plus 0.9% citric acid. Live body weight and feed intake for each bird / day during the experimental periods were recorded. Body weight gain and feed conversion (gm, feed/ gm, gain) were calculated. Nutrient digestion coefficiency of experimental diets were carried out at the final of the experimental period. At 6 weeks of treatment blood sample were collected.