Monensin Toxicity Blamed for California Horses' Deaths: Lab Turtle was the first horse to die from the monensin contaminated horse feed. WARNING: This article contains graphic video. User discretion is advised.

Western Milling Fined $526K for Contaminated Horse Feed: CDFA

Monensin Toxicity

A California agriculture agency says horse feed manufacturer Western Milling must pay a $526,500 cash fine to the state. It is part of a settlement agreement for producing monensin contaminated horse feed.

The California Department of Food and Agriculture states the Goshen facility manufactured the tainted horse feed in September 2015. More than a dozen show horses died or were euthanized due to monensin toxicity.

Dozens of surviving horses at two horse farms can’t be ridden due to the damage caused by the toxin. Monensin is for improving feed efficiency in cattle but is highly poisonous to horses affecting the heart and skeletal muscles.

A Horse Authority investigation in early 2016 found that Western Milling knew about cross-contamination issues for years although the company failed to make the necessary corrections. The CDFA was investigating the company’s practices at that time.

Western Milling Knew About Monensin Contamination Before Horses’ Deaths: FDA

CDFA’s Feed and Livestock Drugs Inspection Program and Western Milling’s settlement states the Goshen facility must install $200,000 worth of new equipment to ensure feed safety measures over and above industry standards.

Despite the upgrades, the O.H. Kruse Grain & Milling Company subsidiary is discontinuing the manufacturing of horse feed at the Goshen facility.

CDFA’s Feed and Livestock Drugs Inspection Program enforces manufacturing, distribution, and labeling regulations for commercial livestock feed.


Did you know monensin toxicity in horses may look like a neurological problem or even colic?

Monensin toxicity may be misdiagnosed when a single horse becomes terminally ill at a farm.

Likewise, if one horse is eating a different feed than it’s stablemates when it dies – it may be misdiagnosed.

An immediate necropsy after the horse’s death, as well as testing the feed for contaminants, prior to making contact with the feed company, is imperative.

Additionally, are all horse feed brands being truthful about their milling practices with their customers and larger equine industry? No, and we have the documents to support the claim.


WARNING: Do not push play unless you are looking for an educational opportunity to see the horrific symptoms of monensin poisoning in horses. No horse should suffer like this.


This video is difficult to watch.





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