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Internal parasites (GI worms) are the primary health problem affecting sheep. The barber pole worm (Haemonchus contortus) is the worm of primary concern. It is a blood-sucking parasite that causes blood and protein loss (anemia) and edema (“bottle jaw”). Worms have developed resistance to most of the anthelmintics (dewormers). Therefore, it is important to worm only as needed. Bringing sheep onto “virgin land” require careful consideration when managing parasites. Studies have found that they can survive on a site for 180 after sheep leave. Rotational grazing is important, not only to have an intensive controlled “mow”, but in controlling parasites.