Occipital condylar dysplasia in a jacob lamb (Ovis aries)
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|Title:||Occipital condylar dysplasia in a jacob lamb (Ovis aries)||Authors:||Lee, Alison Marie; Fletcher, Nicola F.; Rowan, Conor; Jahns, Hanne||Permanent link:||http://hdl.handle.net/10197/11672||Date:||6-May-2017||Online since:||2020-11-05T09:15:50Z||Abstract:||Jacob sheep (Ovis aries) are a pedigree breed known for their “polycerate” (multihorned) phenotype. We describe a four-horned Jacob lamb that exhibited progressive congenital hindlimb ataxia and paresis, and was euthanased four weeks post-partum. Necropsy and CT-scan revealed deformity and asymmetry of the occipital condyles, causing narrowing of the foramen magnum and spinal cord compression. Histopathology demonstrated Wallerian degeneration of the cervical spinal cord at the level of the foramen magnum. These findings are consistent with occipital condylar dysplasia. This condition has been infrequently reported in the literature as a suspected heritable disease of polycerate Jacob sheep in the USA, and is assumed to arise during selection for the polycerate trait. This is the first reported case in European-bred Jacob sheep. Occipital condylar dysplasia should be considered as a differential diagnosis in polycerate Jacob lambs showing ataxia. It is important to raise awareness of this disease due to its suspected heritability and link to the popular polycerate trait.||Type of material:||Journal Article||Publisher:||Faculty of Veterinary Medicine, University of Tripoli||Journal:||Open Veterinary Journal||Volume:||7||Issue:||2||Start page:||126||End page:||131||Copyright (published version):||2017 Faculty of Veterinary Medicine, University of Tripoli||Keywords:||Ataxia; Congenital; Jacob sheep; Occipital condylar dysplasia; Polycerate; Occipitoatlantoaxial malformation; Atlantoaxial instability; Sheep; Quadriplegia||DOI:||10.4314/ovj.v7i2.8||Language:||en||Status of Item:||Peer reviewed||ISSN:||2226-4485|
|Appears in Collections:||Veterinary Medicine Research Collection|
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