Bifidobacterium animalis and breeding method and application thereof

The invention relates to bifidobacterium animalis and a breeding method and application thereof, and belongs to the technical field of bifidobacterium lactis. According to the bifidobacterium animalisdisclosed by the invention, the strain is bifidobacterium animalis IU100 in the bifidobacterium genus, and the preservation number of the strain is CGMCC (China General Microbiological Culture Collection Center) No. 12942. The bifidobacterium animalis strain is a bifidobacterium strain obtained by continuously researching intestinal floras of the longevous in Bama district in Guangxi of China formany years, selecting elder excrement samples with a high intestinal bifidobacteria quantity and carrying out separation and purification by utilizing a selective culture method. The bifidobacteriumanimalis disclosed by the invention not only can improve intestinal health conditions of populations, but also has a potential effect of improving immunity; and meanwhile, the invention provides a simple and feasible breeding m