Many cow producers are aware that gastrointestinal parasites might impair cattle performance and, as a result, take precautions to protect their animals. Anthelmintics (dewormers) are commonly used to control parasites in the gastrointestinal tract. Livestock producers can choose from three types of dewormers:
- benzimidazoles,
- macrocyclic lactones, and
- imidazothiazoles.
Despite the best intentions of cattle producers when it comes to treating their animals for intestinal parasites, routine and repeated anthelmintic therapy is certainly contributing to resistance. Dewormer misuse, like antibiotic resistance, accidentally selects for drug-resistant parasites. Dewormer resistance has been well reported in small ruminant production systems, and producers have had to devise techniques to cope with dewormer treatment's drastically reduced efficacy. Data from cattle herds in the southeast United States and other countries indicate that commercially important livestock parasites are acquiring resistance to conventional dewormers.
With existing procedures of routinely delivering dewormer to all animals on the farm numerous times per year, cattle producers are either 1) administering dewormer to animals that do not require deworming or 2) administering a product with low efficacy in their herd. Both conditions cost the producer money and contribute to the development of dewormer resistance. Producers should examine and alter their parasite management program to reduce the development of dewormer resistance in cattle production systems.
A fecal egg count reduction test on a group of cattle can help producers assess if their current regimen is effective. The fecal egg count decrease test is designed to determine dewormer efficacy by measuring how many parasite eggs are present in the manure before dewormer treatment and how many are present after treatment.
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