NAVLE Urinary

Bovine Ethylene Glycol Toxicity Study Guide

Ethylene glycol (EG) toxicosis is a rare but life-threatening condition in cattle caused by ingestion of antifreeze or contaminated feedstuffs.

Overview and Clinical Importance

Ethylene glycol (EG) toxicosis is a rare but life-threatening condition in cattle caused by ingestion of antifreeze or contaminated feedstuffs. Although more commonly encountered in small animals, bovine cases occur through accidental exposure to automotive antifreeze, contaminated water sources, or adulterated feed products. The condition results in acute renal failure due to the formation of calcium oxalate crystals in renal tubules following hepatic metabolism of ethylene glycol to toxic metabolites.

Understanding the pathophysiology, clinical presentation, and treatment options is essential for veterinarians practicing in both dairy and beef cattle operations. Prompt recognition and early intervention are critical for survival, though prognosis remains guarded to poor once clinical signs develop.

Step/Enzyme Metabolite Clinical Significance
Alcohol Dehydrogenase (ADH) Glycoaldehyde CNS depressant; rate-limiting step; target of antidotal therapy (fomepizole/ethanol)
Aldehyde Dehydrogenase Glycolic Acid PRIMARY cause of metabolic acidosis; correlates with clinical severity
Glycolate Oxidase Glyoxylic Acid Intermediate metabolite; can be detoxified via thiamine and pyridoxine-dependent pathways
Glycolate Oxidase Oxalic Acid Binds calcium forming calcium oxalate crystals; causes acute tubular necrosis and renal failure

Sources of Exposure

Ethylene glycol is a colorless, odorless, sweet-tasting liquid commonly found in automotive antifreeze (concentrations up to 95%), windshield deicer fluids, brake fluids, industrial solvents, and certain pharmaceutical preparations. In cattle, exposure typically occurs through:

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