Severity and distribution of ventral thoracolumbar spondylosis and histological assessment of associated intervertebral disc degeneration in cull rams
| Autor: | Keith G. Thompson, D.M. West, John S. Munday, M C Owen, G. M. B. Orbell |
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| Rok vydání: | 2007 |
| Předmět: |
Male
Radiography Sheep Diseases Pilot Projects Degeneration (medical) Lumbar vertebrae Severity of Illness Index Spinal Osteophytosis Lumbar Severity of illness Ankylosis Animals Medicine Intervertebral Disc Lumbar Vertebrae Sheep General Veterinary business.industry Incidence Intervertebral disc General Medicine Anatomy medicine.disease medicine.anatomical_structure Cervical Vertebrae Spinal Diseases business New Zealand Cervical vertebrae |
| Zdroj: | New Zealand Veterinary Journal. 55:297-301 |
| ISSN: | 1176-0710 0048-0169 |
| DOI: | 10.1080/00480169.2007.36784 |
| Popis: | To conduct a pilot study investigating the incidence and pathology of spondylosis in a sample of cull rams in New Zealand.Vertebral columns from 51 cull rams from different properties were assessed radiographically for evidence of spondylosis. They were graded according to severity, using a four-point grading system. Samples of intervertebral discs representing different grades of spondylosis were examined histopathologically.Forty (78%) rams had spondylosis in at least one intervertebral space. Of these, 11 had ankylosis involving one or more intervertebral spaces. The frequency of spondylosis was greater in the thoracic than lumbar region (p0.001), and was most frequent between T10-T11. Histopathological examination of intervertebral discs associated with all grades of spondylosis revealed degenerative changes in the annulus fibrosis.Spondylosis appeared to be common in cull rams and affected thoracic and lumbar vertebrae. It often involved ankylosis of adjacent vertebrae, and was associated with degeneration of the intervertebral disc.Spondylosis may reduce the serving ability of rams and be an important underlying reason for culling. The pathogenesis of spondylosis is unknown but may involve high mating frequencies during the breeding season. |
| Databáze: | OpenAIRE |
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