“Defend the Flock” campaign logo. Courtesy of USDA. The United States Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) urges all poultry growers to make sure they are doing everything possible to keep their birds healthy and reduce the risk that an infectious disease will spread from their read more USDA APHIS Offers Free Webinar, “Defend the Flock” on September 22, 2:30 p.m.