Introduction
Your feed tests came back clean. You are using a mycotoxin binder. Your animals still are not performing as expected -- FCR is off, health incidents are higher than last year, and nobody can explain why.
The uncomfortable truth: your current mycotoxin binder may only be protecting against half the problem.
A growing body of peer-reviewed research is revealing that the mycotoxin threat in feed is far broader than what standard test panels detect. And the toxins that are hardest to detect may be the most damaging to your animals' gut health.
What Your Standard Test Panel Is Not Telling You
Most feed mills test for the six EU-regulated mycotoxins: aflatoxin B1, deoxynivalenol (DON), fumonisin B1, ochratoxin A, patulin, and zearalenone. These are the toxins with established regulatory limits.
But field surveys analyzing feed from 44 countries and over 1,100 samples consistently find something different: non-regulated and "emerging" mycotoxins are often present at higher frequencies and concentrations than the regulated toxins.
These emerging toxins include:
- Enniatins (ENN A, A1, B, B1)
- Beauvericin
- Apicidin
- Aurofusarin
- Emodin
And here is the problem: most mycotoxin binders are formulated specifically for the regulated toxins -- particularly aflatoxin B1 and DON. They were not designed for the emerging mycotoxin profile.
What the Science Shows
A landmark 2025 peer-reviewed study tested the toxicity of 18 mycotoxins on enteric glial cells (EGCs) -- the cells that control gut barrier integrity, gut motility, and the gut-immune axis.
Non-regulated mycotoxins were among the most toxic compounds tested:
| Mycotoxin | Type | IC50 on EGCs (uM) |
|---|
| Enniatin B1 | Non-regulated | 0.92 |
| Enniatin A | Non-regulated | 0.93 |
| Enniatin A1 | Non-regulated | 1.08 |
| Beauvericin | Non-regulated | 1.41 |
| Apicidin | Non-regulated | 1.63 |
| DON | Regulated | 0.19 |
For comparison, DON -- the most toxic regulated mycotoxin -- had an IC50 of 0.19 uM on the same cells.
The enniatins and beauvericin are cyclohexadepsipeptides produced by Fusarium fungi -- the same fungal family that produces DON and fumonisin. They commonly co-occur with regulated Fusarium toxins in cereal grains, especially in warm, humid storage conditions common across Middle East and Africa.
Why This Matters for Your Operation
When enniatins and beauvericin are present alongside DON -- which is common in wheat, barley, and corn -- they create a multiple-toxin challenge that single-mode binder products may struggle to address.
The realistic scenario:
A feed mill receives a shipment of corn. Standard analysis shows DON at 800 ug/kg -- below EU guidance limits. The mill accepts the shipment. What the analysis does not show: enniatin B1 at 400 ug/kg and beauvericin at 200 ug/kg. Both are toxic to EGCs at these concentrations.
The result: subclinical gut damage, impaired nutrient absorption, and reduced feed conversion -- with no alarm bells from the laboratory.
What Feed Mills and Producers Can Do
1. Expand Your Testing Panel
Ask your laboratory about extended mycotoxin panels that include:
- Enniatins (A, A1, B, B1)
- Beauvericin
- Apicidin
- Aurofusarin
These tests add cost, but they also add clarity -- you cannot manage a risk you cannot measure.
2. Choose a Binder with Broad-Spectrum Activity
Not all mycotoxin binders are equal. Clay-based binders (bentonite, montmorillonite) are highly effective against aflatoxin B1 but have limited efficacy against DON, enniatins, and beauvericin.
Organic sequestrant technologies -- including specialized activated carbons and structured aluminosilicates -- offer broader coverage across both regulated and non-regulated toxins.
ToxyFix Plus was specifically developed for variable ingredient sourcing and high-contamination scenarios where multiple mycotoxins may be present.
3. Review Your Storage Practices
Fusarium mycotoxins -- including DON and the emerging enniatins -- proliferate in stored grain at moisture levels above 14-15% and temperatures above 20C. This is a particular risk in:
- Hot climates (Middle East, Sub-Saharan Africa) where ambient temperatures accelerate fungal growth
- Bulk storage facilities without climate control
- Long transit times at ports and warehouses
Effective drying to below 14% moisture and cool storage (< 15C) significantly reduce but do not eliminate the risk.
4. Monitor Santé Intestinale Indicators
If your FCR has drifted but pathogen testing is clean, consider:
- Gut health scoring at slaughter (intestinal lesion assessment)
- Serum biochemistry for markers of intestinal permeability
- Feed conversion data broken down by batch and ingredient source
The Bottom Line
The mycotoxin landscape in feed is more complex than what standard testing reveals. Emerging toxins -- enniatins, beauvericin, apicidin -- are present in feed ingredients across the Middle East and Africa, frequently co-occurring with regulated toxins, and causing damage to the gut nervous system at concentrations achievable through normal consumption.
A mycotoxin management strategy that only addresses the regulated six may leave your animals exposed to the most damaging toxins in your feed. Broad-spectrum protection, expanded testing, and storage hygiene together form a more complete defense.
This article is based on peer-reviewed research published in Toxins journal. Dabrowski et al. (2025). Impact of Regulated and Non-Regulated Food-Associated Mycotoxines on the Viability and Proliferation of Enteric Glial Cells. Toxins, 17, 587. https://doi.org/10.3390/toxins17120587