FEC

Equine Faecal Egg Counts (FECs): What They Are and Why They Matter

What is a Faecal Egg Count?
A Faecal Egg Count (FEC) is a laboratory test that measures the number of parasite eggs (usually strongyles and ascarids) present in a horse’s manure. This test helps to determine the horse’s worm burden and guides effective worming strategies based on real data — not guesswork.

Why Are FECs Important?
For many years, worming horses was done on a routine schedule. But over time, this led to a serious issue: parasite resistance to common wormers.

FECs allow you to:
Identify horses with high worm burdens that actually need treatment
Avoid unnecessary worming in horses with low or no egg counts
Monitor the effectiveness of your worming program
Help prevent resistance by using targeted treatments only when needed

What Do the Results Mean?
EPG Range Interpretation Action
0 – 200 Low egg count Likely doesn’t need worming
200 – 500 Moderate egg count May need monitoring or treatment
500+ High egg count Likely requires worming

How Often Should FECs Be Done?
We recommend testing:

Every 8–12 weeks during peak worm seasons (spring and autumn)

Before and 14 days after worming to assess treatment effectiveness

Individually — as horses vary in how they carry and shed worms

Who Benefits Most from FEC Testing?
Horse owners who want to manage their worming programs more effectively

Properties with multiple horses or paddock rotation systems

Owners looking to reduce chemical use and preserve wormer efficacy

Those wanting to improve herd health and pasture management

Key Takeaways:
FECs are simple, affordable, and powerful tools in parasite control

They help you target treatment only where needed

Regular testing supports long-term horse health and wormer sustainability

At Cailin’s Critical Care, we offer reliable, accurate Faecal Egg Counts with clear reporting and expert advice. Whether you’re managing a single pony or a herd, we’re here to help you make informed decisions.


📞 Have questions? Contact us any time for support.