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White Wormers for Cattle

White wormers are a class of medication which is used to treat internal parasitic worm infections, specifically roundworms (nematodes). This class typically has a broad spectrum of activity. White wormers should be primarily used in lambs as a first dose in late spring to remove Nematodirus burdens. Resistance to this group is a growing concern, and appropriate management should be implemented to minimise this risk (e.g. wormer rotation planning).