R-CALF USA is calling on the FDA to approve ivermectin to help protect livestock from the possible spread of New World screwworm in the U.S.
The group says that feed-grade ivermectin is a proven tool to protect domestic herds and wildlife, especially in southern border states.
They highlight the success of the drug in limiting the spread of cattle fever tick.
“The potential impact on the United States livestock markets would be immensely negative if an actual case of New World screwworm was identified in the USA. Until an adequate response with gamma ray irradiation of male screw worm flies can be implemented, the feeding of ivermectin is a very real defense.”
The request follows false reports that New World screwworm was found in Missouri. That claim caused a downturn in cattle futures markets and is now being investigated by the state of Missouri.
Top issues facing the beef industry took center stage at CattleCon this year in Nashville.
February 06, 2026 04:58 PM
Representative Henry Cuellar (D-TX), who sits on the U.S. House Appropriations Committee, spoke exclusively with RFD NEWS about what Congress is doing to address screwworm concerns, including funding for a sterile fly production facility in Mexico.
February 06, 2026 12:07 PM
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HHS Secretary Robert Kennedy calls on cattle producers to retain breeding cows while Ivomec receives emergency authorization to prevent New World screwworm.
February 06, 2026 11:48 AM
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Global pork production is expected to rise in the first half of 2026, despite trade volatility stemming from shifting import policies and swine disease pressures.
February 03, 2026 12:50 PM
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Texas Agriculture Commissioner Sid Miller discusses the state’s latest efforts to prevent the New World screwworm from reaching Texas.
February 02, 2026 12:22 PM
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Early indications suggest the U.S. cattle industry may be nearing the end of its liquidation phase. Oklahoma State University livestock economist Dr. Derrell Peel says the industry could be at or near the cyclical low.
January 29, 2026 12:44 PM
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