Smith Joe S, Angelos John A, Chigerwe Munashe
J Am Vet Med Assoc. 2017 Jun 1;250(11):1302-1307. doi: 10.2460/javma.250.11.1302.
OBJECTIVE To describe disorders of performance-age bucking bulls. DESIGN Retrospective case-control study. ANIMALS 78 bucking (cases) and 236 nonbucking (controls) beef bulls. PROCEDURES The medical record database of a referral hospital was reviewed to identify beef bulls > 1 year old that were examined for a medical or musculoskeletal disorder between January 1, 2000, and April 1, 2014. Bucking bulls were designated as cases, and nonbucking bulls were designated as controls. For each bull, the signalment, history, physical examination and diagnostic test results, and clinical diagnosis were recorded. The frequency of each disorder was compared between cases and controls. RESULTS Fifteen of 78 (19%) cases and 132 of 236 (56%) controls had medical disorders; however, the frequency did not differ between the 2 groups for any medical disorder. Musculoskeletal disorders were identified in 55 (70.5%) cases and 109 (46%) controls. Cases were 10.55 times as likely as controls to have horn and sinus disorders. Of the 43 (55%) cases examined because of lameness, the thoracic limb was affected in 19 (44%). Compared with controls, cases were 13.37 and 3.31 times as likely to have a musculoskeletal disorder of the vertebral region and pelvic limb, respectively. CONCLUSIONS AND CLINICAL RELEVANCE Results indicated bucking bulls were more likely than nonbucking bulls to develop horn and sinus disorders and musculoskeletal disorders of the vertebral region and pelvic limbs. The limb distribution of lameness for bucking bulls may differ from that for nonbucking bulls.
目的 描述表演用公牛的行为障碍。 设计 回顾性病例对照研究。 动物 78 头有反抗行为的（病例组）和 236 头无反抗行为的（对照组）肉用公牛。 方法 查阅一家转诊医院的病历数据库，以确定 2000 年 1 月 1 日至 2014 年 4 月 1 日期间因医学或肌肉骨骼疾病接受检查的 1 岁以上肉用公牛。有反抗行为的公牛被指定为病例组，无反抗行为的公牛被指定为对照组。记录每头公牛的特征、病史、体格检查和诊断测试结果以及临床诊断。比较病例组和对照组中每种疾病的发生频率。 结果 78 例（19%）病例组和 236 例（56%）对照组存在医学疾病；然而，两组中任何一种医学疾病的发生频率均无差异。55 例（70.5%）病例组和 109 例（46%）对照组存在肌肉骨骼疾病。病例组患角和鼻窦疾病的可能性是对照组的 10.55 倍。因跛行接受检查的 43 例（55%）病例中，前肢受影响的有 19 例（44%）。与对照组相比，病例组发生脊椎区域和后肢肌肉骨骼疾病的可能性分别是对照组的 13.37 倍和 3.31 倍。 结论及临床意义 结果表明，有反抗行为的公牛比无反抗行为的公牛更易发生角和鼻窦疾病以及脊椎区域和后肢的肌肉骨骼疾病。有反抗行为的公牛跛行的肢体分布可能与无反抗行为的公牛不同。
