Because of its unstable quality and easy pollution, liquid yogurt starter has been gradually eliminated by large yogurt production enterprises, and only some small and medium-sized yogurt factories are still producing in conjunction with some universities or research institutes. Because of the high cost of deep frozen yogurt starter, its wide application is limited. However, after the price of direct-throw yogurt starter was gradually accepted by domestic manufacturers, it was widely used in some large yogurt production enterprises.

In the previous yogurt production process, the strains of yogurt starter should be set up in a separate strain workshop of yogurt manufacturers, and the process of "pure bacteria → activation → expanded propagation → mother starter → intermediate starter → working starter" was completed, with many procedures and strict technical requirements. General manufacturers often have quality problems due to limited production conditions. Therefore, in developed dairy countries, yogurt production enterprises do not make their own leavening agents, but enterprises specializing in leavening agents provide yogurt leavening agents to meet the requirements of fermented dairy production enterprises. At the end of 1988, the Danish Hanson Central Laboratory produced a super concentrated yogurt starter.

DVS Directed Vat Set refers to a series of highly concentrated and standardized freeze-dried starter strains, which can be directly added to the heat-treated raw milk for fermentation without other pretreatment such as activation and expansion. Generally, the number of viable bacteria in direct-cast yogurt starter is101012 cfu/g. Because direct-cast yogurt starter has strong vitality and many kinds, yogurt producers can choose it at will according to their needs, which enriches the varieties of yogurt products, omits the strain workshop and reduces personnel, investment and investment. Direct-throw yogurt starter can be used directly, and it is easy to manage without expanding culture. The production and application of direct-throw yogurt starter can make the production of starter professional, socialized, standardized and unified, thus standardizing the production of yogurt, improving the quality of yogurt and ensuring the interests and health of consumers.