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Summary
An outbreak of acute myopathy affected young cattle, showing severe clinical signs. Treatment with selenium and alpha-tocopherol was ineffective, suggesting other causes for this cattle myopathy.
Area of Science:
- Veterinary Medicine
- Animal Science
- Biochemistry
Background:
- An outbreak of acute myopathy occurred in 23 young Hereford cross and Aberdeen Angus cross heifers.
- Clinical signs included recumbency and ataxia, with one animal drowning.
- Elevated serum creatine phosphokinase (CPK) indicated muscle damage.
Purpose of the Study:
- To investigate the cause of an acute myopathy outbreak in cattle.
- To assess the efficacy of selenium and alpha-tocopherol treatment.
- To evaluate the biochemical status of affected and unaffected animals.
Main Methods:
- Clinical observation and assessment of recumbent and ataxic heifers.
- Measurement of serum creatine phosphokinase (CPK), calcium, magnesium, and inorganic phosphate levels.
- Biochemical analysis of selenium and alpha-tocopherol status.
- Treatment administration and monitoring of affected animals.
Main Results:
- Serum CPK levels correlated with myopathy severity.
- Normal serum calcium, magnesium, and inorganic phosphate levels were observed.
- Myoglobinuria was absent in affected animals.
- Treatment with selenium and/or alpha-tocopherol showed no clear beneficial effect.
- Affected animals had adequate selenium and alpha-tocopherol status.
- Five animals recovered spontaneously or with treatment; two severely affected animals required slaughter.
Conclusions:
- The acute myopathy outbreak in heifers was not clearly linked to selenium or alpha-tocopherol deficiency.
- The ineffectiveness of antioxidant therapy suggests alternative etiologies for the observed myopathy.
- Further investigation is needed to determine the underlying cause of this cattle myopathy.