Yasothai, R.TANUVAS2017-09-012017-09-012017-022278-3687http://krishikosh.egranth.ac.in/handle/1/5810030200The development and composition of the gut microflora in poultry involves several complex mechanisms and are both dependant on many factors, ranging from the age of the birds to dietary ingredients as well as the environment in which the birds are reared. The physiological contribution of gut microflora in poultry nutrition include improvement in digestion through secretion of microbial enzymes, vitamin synthesis, detoxification of some anti-nutritional factors, competitive exclusion of pathogens, development of immune system and intestinal homeostasis. Recently it has been established that gut microflora also play role in the expression of gut gene.en-USVeterinary SciencePoultry ScienceArticle