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By Amanda Greenwood
Associate News Editor
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Mexico has blocked most imports of live animals from the United States after cases of the flesh-eating New World screwworm parasite were detected in Texas and New Mexico, threatening a niche export market for some American farmers while highlighting growing concerns over the spread of the livestock pest.
The restriction, announced Tuesday by Mexico's Agriculture Ministry in coordination with the U.S. Department of Agriculture (USDA), applies to cattle, horses, pigs, sheep and goats.
The move comes as officials on both sides of the border attempt to contain the parasite, whose larvae feed on the living tissue of warm-blooded animals and can cause severe injury or death if left untreated.
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According to Reuters, Mexico has recorded more than 28,000 screwworm cases since the outbreak spread into the country in late 2024. The United States confirmed its first new domestic cases in decades earlier this month, with infections detected in Texas and New Mexico.
While the animal-health threat has grabbed headlines, the restrictions are also expected to have economic consequences for some U.S. farmers.
A Targeted but Immediate Trade Hit
The immediate impact is likely to be limited nationally but significant for some producers.
The United States exports far fewer live animals to Mexico than it imports from its southern neighbor, meaning the overall volume of trade affected by the ban is relatively small.
However, farmers who rely on Mexico as a market for breeding cattle, horses and other specialty livestock could face an abrupt loss of buyers.
Which Farmers Could Be Hit Hardest?
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The effects are expected to be concentrated among exporters and producers in border states.
Animals that would normally be shipped into Mexico may now remain in domestic markets, potentially putting downward pressure on prices in some livestock categories.
Industry analysts have previously warned that even relatively small disruptions to cross-border livestock movements can create localized challenges for producers, feedlots and transport operators that depend on regular trade flows.
Why Are Industry Groups Concerned?
Beyond the immediate trade losses, some agricultural groups worry repeated disruptions could reshape the highly integrated North American cattle industry.
Livestock routinely moves across the U.S.-Mexico border at different stages of production, with animals often raised in one country, fed in another and processed elsewhere.
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Risk of Shifting Value South
One key industry concern is that sustained trade restrictions may push more of the value chain into Mexico.
When live animal exports are limited, Mexican producers are more likely to keep animals domestically, invest in feeding operations, and expand processing capacity. That shift can move labor, investment, and profit away from the U.S. side of the industry.
What Happens Next?
The restrictions are expected to remain in place while Mexican and U.S. authorities assess the outbreak and determine whether additional detections occur.
For now, farmers face a familiar trade-off: short-term disruption to livestock markets in exchange for reducing the risk of a much larger agricultural crisis.
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