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Resistant worms can affect the productivity of lambs by reducing their liveweight gain, using Zolvix can help slow the development of resistance therefore allowing the treatment of productivity limiting worms in the future. Zolvix is: - The only 4-AD (orange) class broad spectrum sheep wormer - Kills All economically significant gut worms, even worms resistant to 1-BZ, 2-LV and 3-ML wormers - Improves Productivity as effective worming allows lambs to grow more efficiently.