Anthelmintics (wormers) are vital to control worm infections and protect against productivity losses. At present, resistant and multi-resistant worms are threatening the efficacy of existing anthelmintics.
There are five main groups of wormers available to sheep farmers in the UK.
The lifecycle starts on pasture where stage three infective larvae wait to be eaten inside water droplets on blades of grass. Once ingested larvae travel into the gut and develop into stage four larvae and then adult worms which then begin to produce eggs.
For more information on sustainable worm control, visit
Learn more about Elanco's worm control products:
Use Rycoben for Nematodirus control
Use Zolvix at mid-late season and for all incoming stock
Watch farmer Simon explain how he has incorporated Zolvix into his worming strategy
Calibration of dosing guns and administration of Zolvix