AVOCADO, PERSEA AMERICANA, POISONING IN HORSES
 
Description    PERSEA AMERICANA, or Avocado, grows in warm climates. Poisoning of horses occurs when they have access to prunings or are pastured in orchards. The major sign is a severe noninfectious mastitis. The inflammation subsides within a week but no more milk is produced that lactation. Ingestion of large amounts of the plant can cause more severe poisoning.
 
Species   Equine
 
Signs   Abnormal lung or pleural sounds, Agalactia, Anorexia, Arrhythmia, Chemosis, Colic, Coughing, Cyanosis, Diarrhea, Dull areas on percussion of chest, thorax, Dyspnea, Generalized weakness, Head, face, ears, jaw, nose, nasal, swelling, Inability to stand, Increased respiratory rate, Mastitis, Muffled, decreased, heart sounds, Reluctant to move, Skin edema, Tachycardia, Underweight, poor condition, thin, emaciated, unthriftiness, ill thrift, Weight loss
 
References   Botha CJ. Plant poisonings and mycotoxicoses of importance in horses in southern Africa. J S Afr Vet Assn 2002;73:91
McKenzie RA. Avocado (persea americana) poisoning of horses. Aust Vet J 1991;68:77
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