The U.S. reopened the Douglas, Arizona, port to cattle imports from Mexico under a phased plan tied to screwworm-control measures, marking the first easing of a ban imposed more than a year ago. Mexico is reinforcing sterile-fly releases and other containment efforts in Sonora and Chihuahua, where 183 and two confirmed cases have been reported, respectively. The USDA plans to assess reopening the Santa Teresa and Columbus, New Mexico, ports for cattle, bison and horses, but said the process could be paused if post-opening audits or other information show increased risk. The reopening is unlikely to quickly reduce record U.S. beef prices because Mexico normally supplies about 1.1 million cattle, or 3% of U.S. supply, while the domestic herd remains at a 75-year low of 86.2 million head.