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d%20in%20the%20spring%20and%20repeated%20in%20the%20fall%20after%20a%20six%20month%20interval.%20%20Optimum%20Deworming%20Program%20for%20control%20of%20S.%20vulgaris%20Optimum%20reduction%20od%20S.%20vulgaris%20infections%20is%20achieved%20by%20reducing%20the%20infectivity%20of%20the%20pastures.%20When%20horses%20are%20running%20on%20pasture%2C%20in%20temperate%20North%20America%2C%20maximum%20pasture%20infectivity%20occurs%20in%20October-December.%20If%20Horses%20are%20removed%20from%20those%20pastures%20in%20January%2C%20pastures%20infectivity%20will%20decline%20to%20zero%20by%20July%201.%20Egg%20production%20of%20S.%20vulgaris%20is%20minimal%20from%20January%20through%20April%20peaking%20in%20August%20and%20declining%20to%20minimal%20values%20in%20December.