The metabolism of L.A.B. and the interactions between the selected strains are responsible for the production of lactic acid, the coagulation of milk proteins, and he production of various compounds.
Variables such as temperature,pH,the presence of oxygen, and the composition of the milk further contribute to the particular features of a specific product.
Fermented milks exhibit a wide variety of textures ranging from liquid drinks such as kefir,koumiss,and and acidophilus milk to semisolid or firm products including yogurt, filmjolk, villi, dahi, and leben.