Autochthonous microflora helps the maturing digestive tract to reach normal length and thickness, ensuring the appropriate structure of the intestinal villi and crypt depth in a young organism (Wostman et al., 1983). Intestinal bacteria are also responsible for the normal morphology of the intestinal wall and epithelium. All these processes make it possible to increase the absorption area, which enhances feed conversion and increases weight gains in animals.