الفهرس 
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Abstract
from the above results it could be concluded that, using Vitabiotic either at the first 3 weeks of age or at the second 3 weeks of age or at entire period enhance productive, physiological and immunological performance of broiler chicks. It was shown that the treatment with Vitabiotic at the first 3 weeks of age had the highest economic efficiency compare with other treatments. So, using of 1gm Vitabiotic/kg diet at the first three weeks more valuable than the used of it at the second three weeks or at entire period.