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For some diseases, grazing management strategies can be used to reduce exposure of susceptible animals to contamination. For example, many internal parasite control programs are based on grazing susceptible young animals on pastures that have previously been grazed by low-risk older animals. Similar strategies have been tried for control of Johne’s disease, although low-risk animals may be difficult to identify, and may be a different group to animals that are low-risk for parasites.