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Control of Stomach Worms – improving sustainability


Internal parasites, in particular gut worms, are a major challenge to sheep production systems. Parasite control is largely based on suppression of the parasitic burden using anthelmintic products.

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Nationally anthelmintic resistance i.e. the ability of parasites to survive a dose that should kill them, is increasing for the 3 most common products we use for control; namely, group 1-BZ (white), group 2-LV (yellow) and group 3-ML (clear).

For the coming seasons we need to focus on four key actions that will help maintain a susceptible worm population and prolong the efficacy of commonly used anthelminthic products.