Integrated Pest Management (IPM) is a systems approach that combines a wide array of livestock production practices with careful monitoring of pests and their natural enemies. Practices and methods often vary among types of livestock and among different regions of the country. In some regions, an increasingly used method is the introduction of wasp parasites for fly control in and around livestock buildings. In other areas, rotational grazing, livestock birth and market dates, breeding pest-tolerant animals, manure management and strict sanitation are used in combination with other methods to manage pests before they reach damaging levels. It is important to realize that insecticides will not work alone for pest control. They should be considered only as supplements, not replacements, for sanitation and sound IPM practices. Complete reliance on pesticides alone allow pests to become difficult to control since they usually develop resistance over time.