Golden oat grass Toxic?

Updated 2026-03-06| 4 min read| 2,817 found this helpful
Trisetum flavescens (L.) P.Beauv.
1

The entire plant is toxic, with active compounds remaining effective even when processed into dry feed

2

Ingestion can trigger enzootic calcinosis in horses and ruminants, leading to locomotor, cardiac and respiratory impairment

3

No specific targeted veterinary treatment is available for poisoning caused by this species

FAQ

Is Golden oat grass toxic to Humans?

No confirmed human poisoning cases reported; large quantity ingestion may potentially cause abnormal calcium metabolism (Unknown)

Is Golden oat grass toxic to Cats?

No documented toxicity cases for cats in available clinical data (Unknown)

Is Golden oat grass toxic to Dogs?

No documented toxicity cases for dogs in available clinical data (Unknown)

Is Golden oat grass toxic to Horses?

Enzootic calcinosis symptoms: reduced milk production, apathy, kyphosis, difficulty standing, shuffling gait, reluctance to move, tenderness and loss of definition in forelimb flexor tendons, elevated heart rate, abdominal breathing, potential hardening of digital arteries and abdominal aorta (Moderate)

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Toxicity Details

Humans
Unknown

No confirmed human poisoning cases reported; large quantity ingestion may potentially cause abnormal calcium metabolism

Cats
Unknown

No documented toxicity cases for cats in available clinical data

Dogs
Unknown

No documented toxicity cases for dogs in available clinical data

Horses
Moderate

Enzootic calcinosis symptoms: reduced milk production, apathy, kyphosis, difficulty standing, shuffling gait, reluctance to move, tenderness and loss of definition in forelimb flexor tendons, elevated heart rate, abdominal breathing, potential hardening of digital arteries and abdominal aorta

Toxicity Snapshot

Toxic PartsThe entire plant
Exposure RouteIngestion of fresh plant or contaminated dry forage
Toxic CompoundsVitamin D3; Calcinogenic glycosides of 1,25-Dihydroxycholecalciferol (1,25-OH-D3)

First Aid & Prevention

First 30 Minutes

  • • Immediately stop the affected animal from ingesting any remaining golden oat grass or contaminated forage
  • • Move the animal to a quiet, low-activity area to avoid exacerbating symptoms
  • • Collect samples of the suspected ingested plant/forage for accurate identification

Contact Vet Immediately

  • • Horses or ruminants show abnormal locomotion including difficulty standing, shuffling gait or reluctance to move
  • • Exposed animals present elevated heart rate, labored breathing or obvious pain responses
  • • Livestock show unexplained reduced milk production or persistent apathy after potential exposure

Prevention

  • • Regularly inspect pastures and forage supplies for golden oat grass, especially in Alpine and pre-Alpine regions
  • • Avoid harvesting forage from areas confirmed to have growth of this toxic grass species
  • • Train livestock handlers to identify golden oat grass to prevent accidental feeding

Treatment & Prognosis

  • • Immediately isolate affected animals from further exposure to the toxic plant
  • • Provide veterinarian-directed supportive care to regulate calcium metabolism and alleviate symptoms
  • • Monitor cardiac and respiratory function of severely affected animals closely
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Professional Toxicology

Scientific NameTrisetum flavescens (L.) P.Beauv.
AliasesYellow oat grass、Wiesen-Goldhafer、Gold-Grannenhafer、Goldhafer、Avoine jaunatre、Gramigna bionda
Toxicity Grade
HumansUnknown
CatsUnknown
DogsUnknown
HorsesModerate
Target Organs
Musculoskeletal systemTendonsDigital arteriesAbdominal aortaHeartRespiratory system
Mechanism of Action

• Calcinogenic glycosides and active vitamin D3 metabolites increase intestinal calcium absorption

• Excess calcium leads to abnormal calcification of soft tissues, tendons, arteries and internal organs, triggering enzootic calcinosis

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Ruminants (cattle, sheep, goats): Ingestion may cause enzootic calcinosis, with symptoms including reduced milk production, apathy, locomotor difficulties and abnormal soft tissue calcification
Confusion Risk

The following plants look similar and may be confused:

Other common non-toxic Poaceae grass species Poaceae family (non-toxic pasture grass species)
Visually similar to most common pasture grasses; golden oat grass can be distinguished by its distinct golden-yellow panicle during flowering, while most non-toxic pasture grasses have green or light brown inflorescences
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Related Toxic Plants

Darnel ryegrass
Darnel ryegrass
Lolium temulentum L.
Moderately toxic, can cause neurological impairment and gastrointestinal distress in livestock and humans
Johnsongrass
Johnsongrass
Sorghum halepense (L.) Pers.
Highly toxic, contains cyanogenic glycosides that may cause fatal poisoning in livestock when ingested wilted or stressed
Sudan grass
Sorghum sudanense (Piper) Stapf
Moderately toxic, may trigger cyanide poisoning in livestock if ingested during periods of drought or frost damage

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Data Sources

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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