الفهرس 
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Abstract
The present study was planned to investigate the effect of some feed additives (choline 0.1%, betaine 0.1%, oxytetracycline 0.04%, yeast 0.3% and sangrovit 0.1%) on performances, blood constituents & biochemistry and histomorphology of growing Japanese quail. A total of 180 unsexed one-week-old healthy Japanese quail were used in 35 day growth performance trial.The results revealed significant increase in growth performance of yeast and sangrovit groups. Moreover, addition of choline, betaine and sangrovit improved feed absorption in small intestine due to increase of intestinal villi length. Betaine supplementation increased RBCs count and haemoglobin, while WBCs count was increased by betaine, yeast and sangrovit supplementations.None of the studied feed additives altered liver biomarker enzymes or histopathology. Although oxytetraycline, yeast and betaine significantly increased uric acid and/or creatinine in serum, Choline and oxytetracycline induced slight histopathological lesions in kidney tissues. Putting the growth performance and safety into consideration, it can be concluding that sangrovit and yeast are the most effective antimicrobial alternatives feed additives in Japanese quail.