Introduction
robiotic, unlike antibiotic, imply the use of live microorganism rather than specific products of their metabolism. Probiotics can be classified into two major types viable microbial cultures and microbial fermentation products. The mode of action have been suggested as beneficial change in gut flora with reduction in population of (E. Coli; b) lactate production with subsequent change in intestinal PH, production of antibiotic-like substances, reduction of toxin release (suppression of E. coli) [1].
Probiotics beneficially affect the host animal by improving its intestinal balance and create gut conditions that suppress harmful microorganisms and favor beneficial ones [2 , 3]. They have been shown to maintain health by reducing risk diseases, possibly through a reduction in proliferation of pathogenic species, maintaining micro biota balance in the gut enhancing immune system and increasing resistance to infection [3,4]. They have been also shown to improve the growth performance of poultry [5].