02/04/2026
Beware of Pasture-Associated Stringhalt in Horses 🐴
Recent dry conditions across southern Australia have triggered a spike in cases of pasture-associated stringhalt (PAS) in horses. This seasonal neurological condition, caused by ingestion of flatweed (Hypochaeris radicata), poses significant risks to equine health. Early detection and immediate pasture management are critical for recovery.
Pasture-associated stringhalt is a debilitating neuromuscular disorder in horses, characterized by abnormal hindlimb movement. Outbreaks are most commonly observed during periods of drought when forage is scarce, leading horses to consume normally unpalatable weeds like flatweed.
Flatweed, which survives dry conditions due to its deep taproot, contains a neurotoxin that targets the peripheral nervous system—especially the long sciatic nerves of the hind limbs in horses. This toxin is not a mycotoxin, nor is it associated with dandelions (Taraxacum officinale), which have been mistakenly implicated due to their similar appearance. Drought and frost conditions appear to amplify the concentration or potency of this neurotoxin in the flatweed plants.
Symptoms of Stringhalt typically develop within 7–21 days of ingestion. Early signs include difficulty walking backward and mild incoordination. Without intervention, the condition can rapidly worsen. Routine checks are recommended for early detection, we recommend a twice weekly check that your horse can walk a few steps backwards during ‘flatweed season’. Diagnosis by your veterinarian is supported by dietary history and pasture inspection.
Immediate removal from affected pasture is crucial. Horses should be provided with hay (2% of body weight/day), ideally with a mix of lucerne and grass hay. We find that quick recovery is often linked to keeping a horse calm and steady during the recovery period, which reduces the misfiring of the nervous system and the incoordination of the legs, which would normally agitate a horse and lead to further nerve aggravation or even injury.
We have had many successful outcomes after pasture-associated Stringhalt with Kohnke’s Own Mag-E, as a daily supplement to provide essential nutrients required by the nervous system for proper nerve and muscle function. Mag-E® provides a special source of highly absorbable organic magnesium chelate and high potency antioxidant vitamin E. A higher initial dose of double or triple the normal dose for the first 7-10 days has found to be helpful in many cases.
Kohnke’s Own Tox Target can also be helpful for horses during recovery. Tox Target is a broad-spectrum mycotoxin binder, with multiple binders that facilitate the binding of mycotoxins, especially those that originate from pasture and hay. Tox Target does not bind flatweed’s specific toxin (it’s not a mycotoxin), but it can bind many environmental mycotoxins that may otherwise exacerbate nerve damage and prolong recovery time.
Recovery ranges from 6 weeks to 18 months, influenced by the original amount of toxin intake, timing of intervention, and management. Cold weather can slow healing, thus stabling and rugging during winter is advised.
Eradicating flatweed from paddocks remains the only sure prevention. Horse owners should act immediately upon noticing symptoms and consult veterinarians for diagnosis and management. Nutritional advice is available through Kohnke’s Own support channels.
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