TO PROTECT AGAINST ANTHELMINTIC RESISTANCE:
Avoid under dosing: it allows more worms (resistant and partially resistant) to survive. Under dosing can occur because the weight of the sheep is underestimated, the applicator is not calibrated correctly or the dose is not administered correctly.
Avoid over use: every time a wormer is used, that class of wormer is being selected for resistance. Reducing the unnecessary use of anthelmintics is important, as well as ensuring the right product is being used every time. Routine faecal egg counts are one method to help determine the need for wormers. Knowing your resistance status will help choose the right products for your farm.
Avoid worming in times of low refugia: for example, try and avoid dosing and moving to clean pasture, by either leaving 10% of the animals untreated or delay the move for a few days after treatment.
Always adopt a farm protection quarantine treatment: new or returning stock should always be subject to a farm protection quarantine treatment, ensuring resistant worms or other parasites are not inadvertently brought on farm. Always yard or house stock for 24-48 hours before turning out on to dirty pasture.