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Musculoskeletal System
Myopathies in Horses
Toxic Myopathies in Horses
Ionophores
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  • Behavior
  • Circulatory System
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Chapters in Musculoskeletal System
  • Musculoskeletal System Introduction
  • Congenital and Inherited Anomalies of the Musculoskeletal System
  • Dystrophies Associated with Calcium, Phosphorus, and Vitamin D
  • Arthropathies in Large Animals
  • Lameness in Cattle
  • Lameness in Goats
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  • Lameness in Pigs
  • Lameness in Sheep
  • Myopathies in Ruminants and Pigs
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  • Bovine Secondary Recumbency
  • Lameness in Small Animals
  • Arthropathies and Related Disorders in Small Animals
  • Myopathies in Small Animals
  • Osteopathies in Small Animals
  • Sarcocystosis
Topics in Myopathies in Horses
  • Overview of Myopathies in Horses
  • Exertional Myopathies in Horses
  • Infectious Myopathies in Horses
  • Immune-Mediated Myopathies in Horses
  • Nutritional Myopathies in Horses
  • Toxic Myopathies in Horses
  • Plants Causing Myopathies in Horses
  • Traumatic and Anesthetic Myopathies in Horses
  • Muscle Cramping in Horses
  • Myotonic Disorders in Horses
  • Hereditary and Congenital Myopathies in Horses
 
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Toxic Myopathies in Horses

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Ionophores

Ionophores are commonly added to ruminant feeds for their growth promotion and coccidiostat properties. Horses, however, are 10 times more sensitive to the toxic effects of ionophores in feed than cattle. When equine feeds are inadvertently contaminated with ionophores or horses eat cattle feed, some animals may die acutely with colic-like signs, myoglobinuria, hypokalemia, cardiac arrhythmia, and tachypnea. Cardiomyopathy is the most common chronic sequela.

Last full review/revision March 2012 by Stephanie J. Valberg, DVM, PhD, DACVIM

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