Lori David N, MacLeay Jennifer M, Turner A Simon
Department of Clinical Sciences, Veterinary Teaching Hospital, Colorado State University, 300 West Drake, Fort Collins, CO 80523-1620, USA.
Vet Radiol Ultrasound. 2005 Mar-Apr;46(2):105-7. doi: 10.1111/j.1740-8261.2005.00021.x.
The purpose of this descriptive study was to characterize the variation in the lumbar spine of the mature ewe. Ventrodorsal and lateral radiographs of the lumbar spine from 216 mature (4-7-year-old) Rambouillet-Columbia cross ewes were examined. Criteria evaluated included the number and orientation of lumbar vertebrae and transverse processes. Observations for fusion of the last lumbar vertebrae with the sacrum and any visible variability seen in transverse processes and ribs were also included. Forty-one percent of the mature ewes had six and 59% had seven lumbar vertebrae. In addition, 7% had abnormal formations at either the first or last lumbar vertebra. Variations seen were the first lumbar vertebra having one rib and one transverse process (7/216, 3%), apparent fusion of the last lumbar vertebra to the sacrum (5/216, 2%) or apparent fusion of one or both of the transverse processes of the last lumbar vertebra to the pelvis (2/216, 1%).
这项描述性研究的目的是描述成年母羊腰椎的变异情况。对216只成熟（4至7岁）的兰布耶美利奴羊-哥伦比亚羊杂交母羊的腰椎进行了腹背位和侧位X线片检查。评估的标准包括腰椎和横突的数量及方向。还包括对最后一个腰椎与骶骨融合情况以及横突和肋骨中任何可见变异的观察。41%的成年母羊有6个腰椎，59%有7个腰椎。此外，7%的母羊在第一个或最后一个腰椎处有异常结构。观察到的变异包括第一腰椎有一根肋骨和一个横突（7/216，3%）、最后一个腰椎与骶骨明显融合（5/216，2%）或最后一个腰椎的一个或两个横突与骨盆明显融合（2/216，1%）。
