| Term | Bracken |
| Category | Herbs |
| Definition | Bracken is a widespread fern that is toxic to horses. It should neither be fed intentionally nor be present in large quantities in pastures or hay. |
| Effects & Risks | Bracken contains, among other things, thiaminases. These can break down vitamin B1 and thereby cause a severe deficiency in horses. In addition, the plant contains other toxic substances such as ptaquiloside. Horses, in particular, are sensitive to long-term ingestion. |
| Use | Bracken has no useful application in horse feeding and should not be fed. Infested pastures should be monitored, and hay contaminated with bracken should not be used as regular horse feed. |
| Fresh or dried? | Bracken is problematic both fresh and dried. Poisoning can also occur via contaminated hay. Drying therefore does not make the plant a safe feed. |
| Important to know | Signs of poisoning often only develop after prolonged ingestion. Possible symptoms include loss of appetite, weight loss, muscle tremors, an unsteady gait, and coordination disorders. In severe cases, seizures and life-threatening neurological disorders may occur. If ingestion is suspected, veterinary advice should be sought at an early stage. |
| Related terms | Poisonous plants · Vitamin B1 · Thiaminase · Field horsetail · Scouring rush |
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