Preventive measures for Parascaris equorum require decreasing the number of parasite eggs shed by horses into the environment by implementing a regular deworming schedule and good pasture management.
Pasture management is best accomplished by raising foals on different pastures from year to year, and separating weanlings from yearlings in order to prevent younger horses from infecting older ones. Additionally, manure should be allowed to compost before it is used on pastures with horses, since fresh manure contaminates the soil with eggs. Horses should be put on fine gravel lots rather than dirt or barren lots. Avoiding overgrazing is also a good preventative measure -- either pastures should be rotated, or horses should be provided two to three acres each.
