Horse Tack Review

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Horse Health Press Release

April 7, 2004 - Feed-Through Fly Control Product Safe When Used As Directed - PHOENIX, Ariz. – (April 6, 2004) Farnam Horse Products has marketed a feed-through fly control product, Equitrol®, for more than 20 years to horse owners nationwide. Since its 1983 introduction, well over 30 million doses of the E.P.A.-registered product have been used safely in several-hundred thousand horses. A recent lower court decision in California ruled against the company—a decision that Farnam is appealing. Farnam believes that this lower court verdict is incorrect on both legal and factual grounds.

“We stand by the product’s safety and effectiveness reflected by its long-standing tenure in the marketplace,” said Chris Jacobi, president of Farnam Horse Products. “All of our products undergo extensive testing before they can become available to consumers, and are designed to help horses and their owners. Indeed, Equitrol has been recently re-registered by the E.P.A.”

The active ingredient in Equitrol is tetrachlorvinphos, which is safely used in feed-through larvicides (manufactured by other companies) for both beef and dairy cattle, as well as fly control products for several other species. In fact, other companies (in addition to Farnam) also manufacture and sell tetrachlorvinphos feed-through larvicides for horses.

Tetrachlorvinphos is a cholinesterase inhibitor. Although Equitrol is formulated to maximally pass through the animal’s digestive system, as with most substances ingested, a minimal amount of the ingredient will be absorbed. Horses exposed to tetrachlorvinphos will, therefore, see a reduction in their whole blood cholinesterase due to the plasma component of the whole blood. Both in-vivo and in-vitro studies have shown that this plasma cholinesterase activity is markedly more sensitive to techrachlorvinphos and merely shows exposure to the ingredient—while blood cell and muscle cholinesterase activities were not affected.

Farnam does not agree that there are any legitimate medical studies or any other medical literature demonstrating that the use of Equitrol on a pregnant or nursing mare would be harmful. However, the company recommends that horse owners discuss with their personal veterinarians its use with specific horses and their particular situation.

For more information about Farnam fly control or other horse products, in the United States call toll free at (800) 234-2269 or direct at (602) 285-1660, or go to on the Internet. Founded in 1946, Farnam Companies, Inc., is a privately held company and a leader in the animal health products industry.

Farnam – We Make Life Better for Animals and Their People. SM