This is a term used for a combination strategy that involves a number of steps. First, take fecal samples and determine the count of parasite eggs in the samples. Next, decide upon the type and amount of deworming product needed to deal with the problem at hand. Finally, use the product at the right time to both deal with the infestation and prevent further parasite reproduction. For example, it's smart to treat your herd early in the springtime before turning them out to pasture. This will help prevent having parasites flourish and spread in the grazing area. Treat your cattle again in the autumn to deal with any parasites they may have picked up while grazing.