The Department of Agriculture and Rural development gave an update yesterday on the state’s response to a national outbreak of bird flu. Michigan has 25 of the country’s 87 infected dairy herds, the most known detections in any state. Since early May, the state has required all dairy farms and commercial poultry operations to institute a handful of biosecurity measures, including a line designating the animals’ secure area and the keeping of log books and disinfecting any people or vehicles that enter the secure area.