On Monday, the US government will reopen part of the southern border to Mexican livestock following a screwworm outbreak. It has reignited a decades-old debate in the cattle industry.

The first Sonora screwworm case was confirmed days before the US reopens cattle imports at Agua Prieta on 24 August, in the state meant to lead the restart.

Ranchers in northern Mexico are preparing to resume cattle exports to the U.S. as a yearlong ban ends.