By Barry Whitworth, DVM / Area Food/Animal Quality and Health Specialist for Eastern Oklahoma
With the overuse of anthelmintics (dewormers) in livestock production, gastrointestinal nematodes (GIN), which are commonly referred to as worms, have developed resistance to many dewormers. According to the United States Food & Drug Administration, anthelmintic resistance is the ability of a GIN to survive a treatment that was effective in the past. For decades, anthelmintic resistance has been a problem with small ruminants; however, this issue is starting to occur more often in cattle. In order to combat this resistance, livestock producers will need to realize that dewormers alone will not solve their parasite problems. Producers will need to take a “holistic” approach to controlling parasites. This will require the use of many practices to decrease parasite burdens. One strategy that is recommended by parasitologists to combat GIN resistance is “quarantine drenching.”
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