Updated: July 28, 2021
By Sarah Potts , Amanda Grev, Ph.D. , Susan Schoenian , and Jeff Semler

Producers can determine if their current deworming program is working by conducting a fecal egg count reduction test on a group of cattle. The premise of this test is to determine dewormer efficacy by measuring how many parasite eggs are present in the manure before and after dewormer application. A dewormer is considered highly effective if there is at least a 95% reduction.

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