The Horse

APR 2019

The Horse:Your Guide To Equine Health Care provides monthly equine health care information to horse owners, breeders, veterinarians, barn/farm managers, trainer/riding instructors, and others involved in the hands-on care of the horse.

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24 April 2019 The Horse | TheHorse.com JILL GRIFFITHS How can you reduce internal parasite infection and manage anthelmintic resistance on your farm? RISK & REALITY D o you know which of your horses has parasites? Chances are they all do, to one extent or another. What's more important is knowing which horses have the highest fecal egg counts and which anthelmintic (deworming) treatments are effective on your farm. These are the first steps in develop- ing a strategic approach to managing equine parasites. When adopting such a management strategy, the primary goal is to prevent horses from amassing extremely high worm burdens, which, although uncommon, can cause signs of colic, diarrhea, and weight loss. Two secondary goals help achieve this: 1. Reducing the worm burden on pastures (which reduces horses' rate of infection and reinfection); and 2. Maintaining the long-term efficacy of available dewormers. Equine parasitologist Martin Nielsen, DVM, PhD, Dipl. ACVM, an associate professor and the Schlaikjer professor of equine infectious disease at the University of Kentucky's Gluck Equine Re- search Center, in Lexington, says that in manag- ing your horses' own parasite population, you are managing that of the entire farm. "The worm population includes the worms in each of the horses and also in manure and on the pasture," he says. "We need to understand that we are treating the parasites, not the horses. Each horse carries a biological sample of the parasite population present on the farm, and we need a co- ordinated effort for the entire population before we can claim that we have a parasite control program." Contrary to the approach taken in the early days ISTOCK.COM

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