Mycotoxins and Aflatoxin in Dairy Cattle Production: Adsorbents and Milk Safety

The challenge of mycotoxins in milk production

Mycotoxins are metabolites produced by fungi that contaminate grains and forages in the field and during storage. In dairy cattle production, the most critical is aflatoxin B1: when ingested with feed, part of it is metabolized and excreted in milk as aflatoxin M1, a compound subject to legal limits due to its risk to consumer health.

For this reason, aflatoxin control is, above all, a matter of food safety and regulatory compliance, not merely of zootechnical performance. The first line of defense is good harvesting, drying, and feed storage practices. Mineral adsorbents act as a complementary layer, reducing the fraction of toxin that reaches the animal's bloodstream.

How clinoptilolite works

Clinoptilolite zeolite is a natural aluminosilicate with a microporous structure and high cation exchange capacity (CEC typically 150 to 190 meq/100g). This porous structure gives it a documented affinity for aflatoxin: in the gastrointestinal tract, the toxin is adsorbed onto the mineral surface and excreted with feces, reducing its bioavailability and, consequently, its transfer to milk.

Technical transparency is warranted: the affinity is stronger and more consistent for aflatoxin than for the full range of mycotoxins. For mycotoxins of other classes, the efficacy of any adsorbent is variable and depends on the molecule. The adsorbent is therefore a management tool, not a standalone guarantee.

Regulatory framework

Clinoptilolite is listed in the official feed additive registers of the applicable regulatory authorities as a technological additive, recognized for the functions of adsorbent, mycotoxin adsorbent, and anti-caking agent. It therefore constitutes an authorized and classified use. It is important to distinguish what this listing means: it recognizes the technological function of the mineral and does not, by itself, endorse zootechnical performance claims. Safety claims must be confined to what the mechanism and the scientific literature support.

Mycotoxin management strategies in milk

Effective control combines prevention and mitigation. The table summarizes the role of each strategy:

Usage Protocol

In a field study, 200 g/cow/day of clinoptilolite (about 1% of dry matter) reduced aflatoxin M1 in milk by an average of 56% [2]. Because it is not absorbed, it leaves no residue in milk. Use is most relevant for higher-risk feed batches.

The adsorbent must be understood as part of a program: it does not replace feed quality control or technical-veterinary monitoring.

Other effects studied

Studies with clinoptilolite in dairy cows investigate effects on ruminal pH and feed efficiency, with results that vary with the diet.

Conclusion

Aflatoxin management in milk is, above all, prevention. As a complementary layer, clinoptilolite is a mycotoxin adsorbent permitted under applicable feed regulations, with documented affinity for aflatoxin and additional benefits of ruminal stability and ammonia control. Used within its regulatory scope and with claims anchored in the mechanism, it is a consistent tool for milk safety and herd efficiency.

References

1. [1] Mumpton, F.A. (1999). La roca magica: Uses of natural zeolites in agriculture and industry. PNAS 96(7), 3463-3470 .
2. [2] Katsoulos, P.D. et al. (2016). In-field evaluation of clinoptilolite feeding efficacy on the reduction of milk aflatoxin M1 concentration in dairy cattle. J. Animal Science and Technology .
3. [3] Applicable regulatory authorities. List of authorized additives — clinoptilolite as adsorbent / mycotoxin adsorbent / anti-caking agent (technological additive).

Informational content. Claims are limited to the adsorption mechanism and regulatory framework; they do not substitute for technical or veterinary guidance.