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[Electron microscopic studies in enzootic muscular dystrophy in cattle]
Archiv Fur Experimentelle Veterinarmedizin
|January 1, 1979
Summary
Selenium deficiency causes white muscle disease in young cattle, leading to myofibril damage. This study reveals ultrastructural changes similar to sheep, highlighting selenium's role in muscle protein health.
Area of Science:
- Veterinary Pathology
- Biochemistry
- Animal Nutrition
Context:
- Enzootic myodystrophy, or white muscle disease, affects young cattle in selenium-deficient regions like Sumava District.
- Clinical signs appear within 4-18 days of grazing, indicating a rapid onset linked to dietary intake.
- Previous research has documented similar conditions in sheep, suggesting a conserved pathological mechanism.
Purpose:
- To investigate the ultrastructural changes in skeletal muscles of cattle with spontaneous enzootic myodystrophy.
- To correlate these changes with selenium deficiency in a specific geographic area.
- To compare the observed pathology with that of nutritional myodegeneration in other species, particularly sheep.
Summary:
- Electron microscopy revealed significant myofibril decomposition, hyalinization, and abnormal fibril synthesis (Z-striation abnormalities) in affected cattle muscles.
- These changes were prominent even in regenerating muscle fibers.
- Mitochondria, sarcoplasmic reticulum, sarcoplasm, and vasculature showed only minor alterations, suggesting a primary impact on contractile proteins.
Impact:
- The findings underscore a critical role for selenium in the structural integrity and maintenance of myofibril proteins in cattle.
- The observed ultrastructural similarities to ovine nutritional myodegeneration suggest a conserved molecular mechanism of selenium's action in muscle.
- This research contributes to understanding the pathogenesis of white muscle disease and informs strategies for selenium supplementation in livestock.