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Timing of Liver Fluke Treatment Is Critical to ROI


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F YOU ARE TREATING FOR LIVER FLUKES THIS SPRING, YOU MAY not be getting the most out of your deworming


dollars. Liver fl ukes are a devastating cattle parasite in


many parts of the United States, with signifi cant focus in the Gulf Coast, decreasing productivity, affecting reproductive health and hurting a producer’s poten- tial profi tability. It is important to treat them, but it is equally important to treat them at the right time. “Currently available fl ukicides are only labeled


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against the adult stage of the liver fl uke,” said Dr. John Davidson, senior professional services veteri- narian with Boehringer Ingelheim Vetmedica, Inc. “Proper and effective treatment of the adult bovine liver fl uke requires awareness of the unique parasite and its life cycle. Based on the life cycle, adults are primarily present in the late summer through late fall on the Gulf Coast of the United States.” The liver fl uke’s complex life cycle involves its


larva spending a couple months in an intermediate host, a species of snail. The parasite emerges from the snail and attaches to plants in or near water sources where cattle graze. Once an animal ingests the small developing stage of the fl ukes, they start to destroy liver tissues and grow into adults and lay eggs. The eggs then pass through the animal in the manure and while in the environment, hatch into larva that search for snails, continuing the life cycle. “Strategically timed administration of effective


products makes the most sense,” Davidson said. “The best available science suggests that using these prod- ucts at times of the year when the vulnerable adult fl uke is absent doesn’t make economic sense for pro- ducers.” Davidson also reminds that, as with many other


drugs used in veterinary medicine, proper drug selec- tion, dosing and timely administration are essential considerations and go a long way toward product stewardship and judicious use, which is critical to their future effi cacy. Work with your veterinarian to understand the life cycle of fl ukes in your area, and treat accordingly.


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