sheep in yards nz

Drench Resistance

Drench resistance is a change in the genes of a worm population that enables some worms to survive drenching. Drench resistance is a farm problem. Resistant genes can be purchased with stock or with land. Destocking will not get rid of resistant worms, as most of the worm population is on the pasture. How does […]

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FAQ Drench

Larval numbers on pasture are generally highest in late spring and autumn. The commonly recommended interval of 28 days between drenches in young stock is aimed at minimising pasture contamination with worm eggs by breaking the worm life cycle

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