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While all intestinal parasites are concerning, one of the most lethal threatens horses during their first 18 months of life. Ascarids, also known as roundworms, are migrating parasites that travel through the bloodstream to the horse’s liver and lungs during their juvenile stage before returning to the small intestine to develop into a mature parasite. Because of this migration, clinical signs of an ascarid infection can vary from respiratory disease to impaction colic, both of which can threaten the foal’s health and potentially his life.
Not only are ascarids a serious concern, but they also have developed widespread resistance to ivermectin and moxidectin1-7, two deworming compounds commonly used to control them. The larvicidal dose of fenbendazole is widely recognized as one of the safest and most efficacious products for treating ascarids, including ivermectin-resistant ascarids.8
Ascarids can also threaten horses older than 18 months that were not effectively dewormed as foals and have harbored an ascarid infection into their adulthood9. In addition to foals, fenbendazole should also be considered as part of a veterinarian-guided deworming regimen for adult horses.
Work with your veterinarian to protect your foals from this potentially fatal parasite and to create a deworming regimen based on fecal egg count tests for every horse in your barn. For more information, visit GetDewormingRight.com.
Consult your veterinarian for assistance in the diagnosis, treatment and control of parasitism. Do not use in horses intended for human consumption.
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