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.
Dr. Rosslyn Biggs with the Oklahoma State University Center for Rural Veterinary Medicine shares insight into biosecurity, preparedness, and animal health concerns facing livestock producers as New World screwworm outbreaks continue in Mexico.
January 07, 2026 12:57 PM
·
Roger McEowen with the Washburn University School of Law joined us to provide legal insight and context on these issues facing agriculture. Today, he discusses pesticide litigation.
January 06, 2026 01:39 PM
·
New World Screwworm cases in Mexico, including one within 200 miles of the U.S. border, are adding pressure to livestock markets and trade decisions.
January 06, 2026 12:09 PM
·
Last year was a busy year for pesticide litigation in the United States. At No. 10, it kicks off RFD-TV Legal Expert Roger McEowen’s list of the “Top 10” Agricultural Law and Tax Developments of 2025.
January 06, 2026 11:06 AM
·
Preserving equity through active risk management remains critical in a volatile, supply-driven market.
January 06, 2026 06:00 AM
·
As markets anticipate a return to normal trading following the New Year’s holiday, the possibility of the southern border re-opening to cattle is capturing much attention.
December 30, 2025 11:28 AM
