Probiotic microorganisms are defined as live microorganisms that confer a health benefit on the host, when administered in adequate amounts . Microorganisms from several selected bacterial genera such as Lactobacillus are currently utilized as probiotics, however the members of genus Bifidobacterium are also believed to possess probiotic activities . Bifidobacteria are gram-positive procaryotes that naturally inhabit the gastrointestinal tract of humans and others warm-blooded animals . Bifidobacteria possess health-improving properties by maintaining improved intestinal microflora, reducing serum cholesterol, inhibiting the growth of potential pathogens, stimulating the immune responses, and exhibiting anticarcinogenic activity . Recently, as the market for functional food grows, probiotic products are gaining a great attention by the consumers.