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首页> 外文学位 >Various factors involved in control, treatment, and investigation of bovine respiratory disease in high risk feedlot cattle.
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Various factors involved in control, treatment, and investigation of bovine respiratory disease in high risk feedlot cattle.

机译：控制，治疗和调查高危育肥牛牛呼吸道疾病的各种因素。

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摘要

Bovine Respiratory Disease Complex (BRDC) is the most common and costly disease in feedlot cattle in North America. Annual economic losses are estimated to be US;Two multi-site prospective studies were conducted to evaluate the comparative efficacy of the administration of gamithromycin and tulathromycin for the treatment and control of BRDC. A total of 2,529 animals were enrolled at two commercial feedlot locations to evaluate the efficacy of the antimicrobials to control BRDC. Morbidity due to BRDC was higher (P = 0.03) among calves receiving gamithromycin compared with those receiving tulathromycin; however, treatments were considered bioequivalent (P < 0.05) for BRDC mortality, case fatality rate and re-treatment rate. Final BW, ADG, DMI and F:G, were similar (P < 0.05) between the groups of calves receiving gamithromycin and tulathromycin. For the evaluation of treatment efficacy, a total of 1,049 calves were enrolled in the study. Re-treatment rate was higher among animals treated with gamithromycin compared with those treated with tulathromycin. Treatments were bioequivalent (P < 0.05) for case fatality rate, final BW, and ADG.;To evaluate factors associated with BRDC, a retrospective study was conducted to analyze BRDC mortality and morbidity associated with initial body weight, rectal temperature, and castration and dehorning (tipping) at processing. Calves with lighter weights and fever at processing were at greater risk of mortality and morbidity due to BRDC. Also, bulls castrated at processing were at higher risk of developing BRDC. Finally, we developed control charts based on SPC principles to monitor and identify "normal" and special cases of variation of mortality rate. In feedlot cattle, monitoring lots of cattle through SPC principles can be used as a powerful tool for continuous improvement.
机译：牛呼吸系统疾病综合症（BRDC）是北美饲养场牛中最常见，成本最高的疾病。估计每年的经济损失为美国；进行了两项多点前瞻性研究，以评估加米霉素和图拉霉素对BRDC的治疗和控制的相对疗效。在两个商业育肥场位置总共招募了2,529只动物，以评估抗微生物剂控制BRDC的功效。接受加米霉素的小牛比接受图拉霉素的小牛的BRDC致病率更高（P = 0.03）。但是，BRDC死亡率，病死率和再治疗率被认为与生物等效（P <0.05）。接受加米霉素和图拉霉素的犊牛组之间的最终体重，ADG，DMI和F：G相似（P <0.05）。为了评估治疗效果，该研究共招募了1,049只犊牛。加米霉素治疗的动物的再治疗率高于图拉霉素治疗的动物。病死率，最终体重和平均日增重均采用生物等效治疗（P <0.05）。为评估与BRDC相关的因素，进行了一项回顾性研究，以分析与初始体重，直肠温度和去势及相关的BRDC死亡率和发病率。处理时的除角（倾倒）。由于BRDC，体重减轻和发烧的犊牛死亡和发病的风险较高。同样，在加工过程中cast割的公牛患BRDC的风险更高。最后，我们根据SPC原理开发了控制图，以监视和识别死亡率变化的“正常”和特殊情况。在饲养场牛中，通过SPC原理监视大量牛可以用作持续改进的有力工具。

著录项

  • 作者

    Torres, Siddartha.;

  • 作者单位

    Kansas State University.;

  • 授予单位 Kansas State University.;
  • 学科 Agriculture Animal Pathology.;Agriculture Animal Culture and Nutrition.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 129 p.
  • 总页数 129
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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