The phased reopening of a third southern U.S. cattle port is a reminder that animal-health controls are now operating as trade infrastructure, not simply as an emergency response. On 20 October, the U.S. Department of Agriculture's Animal and Plant Health Inspection Service (APHIS) said the Columbus, New Mexico, port would reopen to cattle imports from Mexico on 26 October, subject to enhanced safeguards against New World screwworm and continued assessment of animal-health conditions.

For cattle supply chains, each reopening matters because it restores a practical route through which eligible livestock can reach U.S. buyers. APHIS has made the process explicitly conditional: the agency says further decisions depend on animal-health risk, operational readiness and the effectiveness of mitigation measures. That makes biosecurity performance, inspection capacity and cross-border coordination operational variables for market access.

The Columbus move sits within a wider staged approach. APHIS said Nogales, Arizona, was scheduled to reopen to cattle imports on 30 November if conditions continued to support safe trade and the necessary inspection arrangements and infrastructure were in place. The same 20 October update also resumed land importation of equines from Mexico through Santa Teresa, New Mexico.

The agency described a separate process for equines: inspection and treatment before export, followed by a seven-day quarantine before release in the United States. Although the cattle and equine arrangements are not identical, both illustrate the commercial logic of phased reopening. Authorities can restore activity incrementally while retaining checkpoints designed to prevent a pest from becoming a wider livestock-sector disruption.

For producers, feedlots, traders and veterinary-service providers, the immediate significance is not a promise of normalised trade. It is a structured route back to movement under controls. The timetable remains conditional, but the reopening signals that compliant animal-health protocols can reopen physical trade capacity even while a serious cross-border risk remains under active management.

For more information: U.S. Department of Agriculture Animal and Plant Health Inspection Service