05/06/2026
🪱 WORM EGG COUNTS IN HORSES🪱
As resistance to wormers is becoming a more and more relevant issue to horses in the UK, testing faecal samples for worm egg counts before worming is the recommended approach 🧫
The advice for each specific horse will vary depending on many factors, such as the age and medical history of the horse, the worming history of the herd, and other management factors.
However, carrying out worm egg counts three times per year will be sufficient for most horses. These do not test for tapeworm, so a saliva test for tapeworm is recommended once per year.
There is a blood test for encysted redworm, which also doesn’t show up on a worm egg count. This can be helpful in determining whether a horse needs worming in the autumn or not.
As were are now in spring it is a great time to test 🌿
Moving away from blanket treating all horses is important as we only have one drug that treats encysted redworm and only two that treat tapeworm. We need to preserve efficacy of these drugs by not treating horses that don’t need it and not contributing to resistance.
Therefore, only horses that are shedding large numbers of worm eggs should be treated.
Other methods of reducing worm risk in horses include:
💩 Regular (more than once weekly) poo picking of fields, rather than harrowing
💩 Keeping muck heaps more than 3m away from fields
Faecal samples can be handed in to us for worm egg counts to be performed. 🔬
For further information or to assess your individual horse’s worm risk, please get in touch with us or see the CANTER guidelines. 📲