Two Cases of Suspected Poisoning With Goat's Rue (Galega officinalis L.) in Horses.
Authors: Blanchard Tiphaine, Fantinati Marco, Domange Céline, Priymenko Nathalie
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Goat's rue (Galega officinalis) has caused acute respiratory disease in two Arabian mares that inadvertently ingested the plant through contaminated hay, with botanical analysis confirming daily exposure to approximately 14 g of dry matter over three consecutive days. Both animals presented with pulmonary oedema, though the older mare (21 years) developed more severe clinical signs including marked dyspnoea and frothy nasal discharge compared to the younger (6-year-old) individual. Whilst horses typically reject fresh goat's rue due to poor palatability, this case series highlights a genuine risk when the plant becomes incorporated into processed forage—a scenario that may be overlooked during routine feed quality assessment. Recovery was achieved through immediate dietary change and supportive treatment, though the older mare required approximately two weeks to fully resolve clinical signs versus just three days for the younger horse, suggesting age-related differences in resilience or clearance. Equine professionals should be alert to the possibility of goat's rue contamination in hay and haylage supplies, particularly when investigating unexplained acute respiratory disease in grazing or stabled horses, and consider botanical analysis of suspect forage as part of diagnostic investigation.
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Practical Takeaways
- •Inspect hay and processed feeds for Galega officinalis contamination, particularly in dried form where palatability increases and risk of accidental ingestion rises
- •Recognize acute respiratory signs and pulmonary edema as potential indicators of goat's rue poisoning; remove contaminated feed immediately and provide supportive care including dietary management
- •Older horses may have longer recovery periods from toxin exposure; monitor recovery closely and adjust treatment duration based on age and clinical response
Key Findings
- •Two Arabian mares developed acute respiratory signs and pulmonary edema after ingesting approximately 14 g/day of dried Galega officinalis for three days
- •The 6-year-old mare recovered fully within 3 days while the 21-year-old mare required approximately 2 weeks for recovery following dietary change and treatment
- •Galega officinalis was identified in hay provided ad libitum, despite the plant having low palatability in fresh form
- •Poisoning risk increases when goat's rue is present in dried and processed feed material rather than fresh pasture