What to know about official identification for exhibition swine in 2021 April 1, 2021 Breeders, exhibitors, county fairs and exhibitions need to know these changes in acquiring official identification for show pigs. Photo by Phil Roeder, CC BY 2.0 With the 2021 show season just around the corner, there are some important changes regarding swine tagging that breeders, exhibitors, county fairs and exhibitions must know. Public Act 466 (Animal Industry Act) requires pigs shown at fairs, exhibitions or shows must have official individual animal identification (ID). The requirement reflects a change in how the Michigan Department of Agriculture and Rural Development (MDARD) will manage the animal identification program.