 More fair time precautions. I'm Larry Lee with the Brownfield Dairy Update. Iowa will require lactating dairy cows to be tested for the H5N1 virus before they can be taken to fairs and exhibitions. Ag Secretary Mike Nagg issued the order Tuesday requiring Iowa dairy exhibitors to have a completed negative HPAI test within seven days of the exhibition starting on Monday. This order is similar to orders that are already in place for Minnesota and Wisconsin.