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dc.contributor.author | Van der Lugt, Jaco J.![]() |
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dc.contributor.editor | Verwoerd, Daniel Wynand | |
dc.contributor.upauthor | Prozesky, Leon | |
dc.date.accessioned | 2014-09-30T09:13:04Z | |
dc.date.available | 2014-09-30T09:13:04Z | |
dc.date.created | 2014 | |
dc.date.issued | 1989 | |
dc.description | The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. | en |
dc.description.abstract | Blindness attributed to vitamin A deficiency afflicted 47 out of 197, and 15 out of 29 new-born dairy calves on 2 farms. Other clinical signs included doming of the forehead, thickening of the carpal joints, incoordination and weakness. Gross lesions in 8 of the calves examined consisted in hydrocephalus and thickened occipital and sphenoid bones. In 4 of these calves the optic nerves were constricted as a result of a reduction in size and dorsoventral narrowing of the optic canals. Microscopical changes in the optic nerves were characterized by necrosis, demyelination and fibrosis. Oedema or gliosis of the optic disc occurred in some of the calves. Retinal lesions included atrophy and gliosis of the ganglion cell layer and the nerve fibre layer. Three of the calves showed focal retinal dysplasia with occasional rosette formation. | en |
dc.description.librarian | lmchunu2014 | en |
dc.description.librarian | mn2014 | |
dc.identifier.citation | Van der Lugt, JJ & Prozesky, L 1989, 'The pathology of blindness in new-born calves caused by hypovitaminosis A', Onderstepoort Journal of Veterinary Research, vol. 56, no. 2, pp. 99 -109. | en |
dc.identifier.issn | 0330-2465 | |
dc.identifier.uri | http://hdl.handle.net/2263/42135 | |
dc.language.iso | en | en |
dc.publisher | Published by the Government Printer, Pretoria. | en |
dc.rights | © ARC-Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © University of Pretoria. Dept of Library Services (digital). | en |
dc.subject | Veterinary medicine | en |
dc.subject.lcsh | Veterinary medicine -- South Africa | |
dc.title | The pathology of blindness in new-born calves caused by hypovitaminosis A | en |
dc.type | Article | en |