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Pigs are susceptible to many different internal and external parasites. You can be sure that in a free-ranging environment where the pigs eat feces and vegetable waste they will be heavily infested with parasites. In attempting to improve production one must rid the pigs of parasites or they will not be able to utilize the feed efficiently. Feed is always too expensive to give to parasites. Treatment for parasites is expensive, potentially harmful to the pig, and does not prevent reinfection. Prevention and control of parasites by breaking their life cycle is far more important than treatment. With both internal and external parasites it is important for you to know the various life stages and habits so that you can plan to disrupt their life cycles and destroy them. Pigs are also the intermediate host for many parasites that affect man. Therefore, eliminating parasites in swine will serve to eliminate them from man as well. The information that follows on different internal and external parasites should help you in your plans to break parasite life cycles by giving you an understanding of how each parasite develops.