الفهرس 
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Abstract
Dietary probiotic supplementation effects were investigated on the microscopic structure as well as growth performance specially; body weights and organs wet weights. A total of 5000 Arbor Acres broilers from a local company (Ommat) were raised from 1 to 35 days old. The treated birds were offered diet mixed with bacillus subtilis PB6 (CloSTAT) based probiotic at inclusion rate of 0.5 Kg/ 1000 Kg, while the control ones received conventional diet free from probiotics. Samples from cloacal bursa, spleen and different intestinal regions were collected on weekly basis for histological examination. It was found that these biological additives enhanced the previous growth rate levels and immunity in treated birds indicated by a higher cellular density of bursal lymph nodules with increased epithelial surface area. In addition, a marked appearance of cecal tonsils and doubling of the spleen wet weight was obtained. Bacillus subtilis based probiotic had a favorable effect on histomorphological analysis of intestinal segments with a noticed modulation in mucin dynamics in most of them, together with the cloacal bursa of treated birds rather than the control ones.