FILE - In this image provided by the U.S. Department of Agriculture, a researcher performs a rapid antigen test on milk from a dairy cow inoculated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Monday, July 29, 2024. (USDA Agricultural Research Service via AP, File)

FILE - Cows stand in the milking parlor of a dairy farm in New Vienna, Iowa, on Monday, July 24, 2023. (AP Photo/Charlie Neibergall, File)