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You’ll have heard the mantra ‘95% of worms on your farm are on pasture’. Learn about the drivers of worm challenge on your pastures so you can reduce worm intake by susceptible stock.  … Where do the larvae live?  The vast majority of your total worm population (85 to 95%!) lives on pasture – as L3 larvae. The rest are: In the soil – a few larvae and eggs. In dung pats – eggs and developing larvae. Inside your animals – as juvenile worms, adults and eggs. Think of your farm as a worm iceberg. …

Worm species … Meet your enemies! Learn about the important worm species of sheep – effects on the animal, seasonal pattern, diagnosis, treatment and prevention strategies. Inside the animal  Sheep worms most often live in the abomasum (4th stomach) and the small intestine. Some worms can exist in both. Sheep almost always carry a mix of worm species.   … Where and how bad?  Most worm species are found throughout New Zealand – with some regional differences.  For example, Haemonchus (Barber’s …

Drench resistance is evolution in action (remember Darwin?). Here we examine the risk factors for developing drench resistance on your farm. We also show you what you can do to assess your own situation. … 'Drench resistance' is present on a farm when there are a measurable number of worms surviving in the animals after treatment with anthelmintics. You can test for it with simple 'drench checks' or a more detailed faecal egg count reduction test. Management practices that improve nutrition to …

The term ‘Refugia’ can be really confusing! The outcome we want is to stop your farm from becoming dominated by drench-resistant worms. Using Refugia means leaving some worms free to breed without ‘screening’ by drench. There are various ways to achieve this.  … What is Refugia? The term Refugia means a worm population that can reproduce without being exposed to drenching.  Keeping a population (or refuge) of drench-susceptible worms on the farm can slow the build-up of parasites resistant (R) …