author(s)
Dr. Mvan Suryanarayana

abstract
Ever since the ban on the use of antibiotics was imposed, it has become imperative to find alternatives like organic acids, plant extracts, pre and probiotics. Prebiotics maintain gut health with beneficial bacteria by eliminating the pathogens as they become intestinal barrier against invading pathogens are said to be effective against the two most potent intestinal pathogens viz- Salmonella and E. coli. Prebiotics not only enhances the proliferation of epithelial cells but also show stimulatory effects on both exocrine and endocrine secretions of the pancreas. They produce SCFA which as an energy source for the colonocytes. FOS and multi strain probiotics with Bifidobacterium longum, Lactobacillus acidophilus, Bacillus subtilis, Saccharomyces cerevisieae Aspergillus oryzae improved FCR and weight gain. The main role of probiotics being a reduction of pH controlling pathogens, production of inhibitory substances like organic acids, stimulation of specific and non specific immunity and other related activities. It was reported by many researchers that probiotics improve feed efficiency, performance and milk fat composition. It is concluded that feed additives is more efficient when fed in combination rather than fed individually. The concept of synbiotic, a combination of pre- and probiotics components has been designated to focus on health enhancing foods and supplements used as functional food ingredients. It seems that synergistic effects of prebiotics and probiotics can be useful in stimulating beneficial bacteria and improving the health of the gut.