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Take the guesswork out of worming

What is a worm egg count?

A worm egg count is a microscopic examination of a dung sample from a horse, to identify and count the number of roundworm eggs present. Worm egg counts help identify which horses are affected and need treatment. The egg count is expressed as eggs per gram (epg). In most cases, if the count is greater than 200 epg you should consider worming†.

Remember - use worm egg counts as part of your worming program - ask your VET or SQP for further advice

Why are egg counts important?

Worm egg counts are important for helping to ensure that only horses with proven infection get treated. Unnecessary worming is undesirable. Carrying out worm egg counts is in the interest of all horse owners, to ensure that currently available wormers stay as effective as possible for as long as possible.

What exactly is resistance?

Resistance is when a greater frequency of individuals in a parasite population, usually affected by a dose or concentration of compound, are no longer affected. Once resistance is present in a worm population, the health, welfare and performance of horses infested with resistant worms will be compromised. For this reason it is essential that your horse is dosed accurately according to bodyweight.

Click here to find out how to calculate the EQVALAN/EQVALAN Duo dose for your pony or horse

Using too low a dose of wormer may speed up the development of resistance. On the other hand, frequent, unnecessary worming may also increase the potential for resistance. The key to reducing the likelihood of resistance is choosing the right wormer, then giving it at the correct dose and time. Worm egg counts have an important role in this, as they help you to identify when your horse actually needs to be wormed.

Use worm egg counts as part of a SMART worming programme

Combining worm egg counts and worming

You should always undertake a worm egg count a few days before you plan to dose, to determine the roundworm burden of your horse. It is advisable to ask your vet about performing a blood test (ELISA) in Spring and Autumn to verify whether your horse needs to be treated for tapeworm, as worm egg counts do not identify tapeworms or encysted small redworms. Encysted small redworm treatment should be considered during the winter months.

Undertaking worm egg counts will help to ensure that your horse is only wormed when needed, to help prevent the development of resistance. Rotation of chemical classes will also help them to remain effective for as long as possible.

† Some foals and horses (especially those with no previous worming history) with a worm egg count less than 200 epg may still require treatment; consult your vet for further advice.