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Mexican ranchers struggle to adapt as a tiny parasite ravages their cattle exports to the US

SONORA, MEXICO, AUG 5 – The US Department of Agriculture halted Mexican cattle imports three times since last November due to screwworm infestations, with over 2,258 cases reported in Mexico, officials said.

  • Amid parasite concerns, U.S. agriculture officials halted live cattle crossing in July, the third suspension in eight months, citing a `devastating pest`.
  • As the screwworm was found in southern Mexico, officials warned of its northward spread, with larvae of Cochliomyia hominivorax invading warm-blooded tissue.
  • This year, Mexican ranchers exported fewer than 200,000 head of cattle, less than half the usual, due to a parasite outbreak impacting exports to the US.
  • In Hermosillo, rancher Martín Ibarra Vargas warned the import ban came at a dire time after two years of drought, reducing his herd and forcing debt.
  • Ibarra Vargas warned that without a market or money for feed, many ranchers could be forced out, as they lack funds to continue feeding calves, despite pleas to the U.S.
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Winnipeg Free Press broke the news in Winnipeg, Canada on Monday, August 4, 2025.
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