64: Fecal egg counts: what's the point?

This week, we are following up on last week’s topic about the adverse effects of parasites on our horses by talking about fecal egg counts.

As horse owners, it is essential to understand what fecal egg counts are, the valuable information they provide, and how to use those insights to evaluate and assess parasite control strategies for your horse or, in some cases, an entire herd.

What is a Fecal Egg Count?

A fecal egg count is a diagnostic test, usually performed by veterinary clinics, to identify the presence and number of parasite eggs in a horse’s manure. It provides critical information for understanding the intestinal immunity of horses and creating parasite control strategies.

Why Fecal Egg Counts Matter

Knowing the shedding status of their horses helps owners tailor a targeted and effective parasite control plan. Strongyles, the most prevalent equine parasite, are a big concern for equine health due to their resistance to deworming treatments. Fecal egg counts guide deworming practices and help prevent the overuse of chemical dewormers.

Timing and Accuracy

Fecal testing is usually done in the spring and fall to align with parasite life cycles. In the fall, parasites often go into hibernation and stop shedding eggs. So spring, when eggs get actively shed, is a far better time to assess parasite load. Relying on a single test can be misleading, whereas multiple tests over time can provide more accurate insights.

Parasites Not Detected by Fecal Tests

Fecal egg counts do not detect all parasites as some go through life stages where they do not shed any eggs. So, owners must also consider regional risks and symptoms when planning a parasite control strategy for their horses.

Parasite Risk Factors

Parasites exploit weak immune systems, so immunity is a key factor for susceptibility. The immature immune systems of young horses make them particularly vulnerable, and older horses may also be at risk due to declining health. Domesticated horses, living in controlled environments, are often at greater risk than wild horses as they have less natural resistance and more exposure.

Holistic Parasite Management

Effective parasite management often requires more than just deworming. Supporting horse's immune systems, microbiomes, and overall health can make the internal environment less hospitable to parasites. A strategic approach should include nutrition, environment, and individualized care for reducing egg counts and building long-term resilience.

Hidden Symptoms

Horses can look healthy and still carry a high parasite load. So, even though fecal egg counts provide a baseline, it is still essential to evaluate the overall health of each horse.

Horses with Chronic Health Conditions

Parasites can exacerbate any issues that horses with chronic health conditions may have. High parasite loads can cause ulcers, inflammation, and poor nutrient absorption. Addressing parasites is a top priority in those cases, as the immune system cannot recover until that burden gets reduced.

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