Appropriations: supplemental; funding to test facilities and backyard flocks for bird flu (H5N1); provide for. Creates appropriation act.

HB 4173 is a supplemental funding bill that allocates state money specifically for testing commercial poultry facilities and backyard flocks in Michigan for H5N1 bird flu. It directly affects poultry farmers, commercial hatcheries, and state agricultural testing labs by providing resources to conduct these tests. The key mechanism is creating a new appropriation (funding line) within the state budget for this purpose, separate from regular funding. This bill focuses solely on enabling testing capacity, not on disease prevention or other policy changes.