Isolated Bifidobacterium strains are obtained that secrete a siderophore that inhibits the growth of microbes in the gastrointestinal tract of an animal. Drying gas of low-molecular silicone generated in a drying gas generation part is heated by a heater and thereafter supplied from a drying gas supply nozzle. A set of synchronization data lines may connect the first stateful elements to the second stateful elements in a pairwise manner.