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    SMALL STRONGYLE RESISTANCE TO MACROCYCLIC LACTONE DEWORMERS REPORTED IN KENTUCKY

    Nov 03, 2020 2 minutes

    The first North American cases of small strongyle resistance to macrocyclic lactones, the chemical class of dewormers most widely used in horses, has been reported by researchers at the University of Kentucky. Parasites are considered resistant when a significant proportion of the population can withstand the effects of chemical agents administered to eliminate them.

    While resistance to the other two chemical classes of equine dewormers—benzimidazole and

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