Stockyards in New Mexico that had closed due to the New World screwworm outbreak are bustling again. The gates at the Columbus port of entry opened Monday, marking the first time since 2024 that Mexican cattle have crossed here. It's the third port to reopen since August as the U.S. Department of Agriculture works with Mexican officials to normalize cross-border livestock trading under tighter biosecurity rules. U.S. Agriculture Secretary Brooke Rollins says the new framework means the U.S. and Mexico are better prepared for other future biological threats. In this case, the playbook includes expanded surveillance, multiple layers of cattle inspections and the release of more than 1.6 billion sterile flies across the region.