Probotics are non-pathogenic living microorganism which can be used in food in order to improve the normal flora of host intestine. Therefore, it is essential to select species that have the ability to survive a long time to maintain their role in industrial process. Probotic microorganism are isolated from gastrointestinal system lactobacillus and bifidobacterum species are widely known. Probotic supplemented animals have benefical effect on increase in milk production, improvement in productivity of animal due to probotic can be associated with an increase in digestion and absorption of nutrients. Probotic strains administered separately or in combination, significantly improved feed intake, feed conversion rate, daily weight gain and total body weight. Health benefit of probiotic are maintaining normal flora, protection of digestive tract, improvement of immune system, reduction in blood cholesterol levels and blood pressure, anti-cancer activity and improvement of nutrient absorption. Probotics are involved in treatment of disease. The improvement in metabolic process where due to improved development of gut and increased microvillus height which led to enlargement of the microvillus absorptive surface and enabled the optimal utilization of nutrient. The mechanisms of action of probotic bacteria and their effect in combating digestive disorders in animal and human has been demonstrated and supported in numerous scientific studies. Probotic bacteria are used in wide range of nutritional technique in order to support the host organism. The improvement in productive performance of livestock's and poultry species fed with probiotics was mostly due to promoted the metabolic processes of digestion and nutrient utilization, exerting enzymatic activities, increasing the passage rate of digestion and deconjugating bile salts and acids. The improvement in metabolic processes were due to improved development of the gut and increased microvillus height which led to ........