Animal microecologcial modulalcr are live microorganic agents with the normal microflora. It can exert very important functions through following mechanisms:dominant microbial flora,colonization resistance,improvement of ecological environment and adjustment for microflora balance,production of antibacterial substances,strengthening epithelial barrier and enhancement of immunity of functions,etc. A lot of tests and practical applications have proved that animal microecollogics can not only impro...