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首页> 外文期刊>The Bovine Practitioner >Effect of Vaccination and Weaning Timing on Backgrounding Morbidity in Preconditioned Beef Feeder Calves
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Effect of Vaccination and Weaning Timing on Backgrounding Morbidity in Preconditioned Beef Feeder Calves

机译：接种疫苗和断奶时间对牛肉预处理犊牛本底发病率的影响

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Bovine respiratory disease is the most common illness in post-weaned beef calves, and numerous preconditioning programs have been designed to mitigate the impact of this disease syndrome. Preconditioning programs rely on proper implementation of tools, including vaccination and weaning, to prepare the calf to successfully overcome disease challenges. Our objective was to determine whether backgrounding morbidity was associated with the timing of previous vaccinations and the number of days weaned prior to commingling of beef feeder calves. Data were procured over a six-year period from 85 producers that preconditioned calves and placed them in a commingled backgrounding lot for approximately three months. Generalized linear mixed models were utilized to assess the impact of the number of days between first and second viral vaccinations, number of days between the final viral vaccination and commingling and the number of days weaned prior to commingling. Hypothesis testing was performed using P<0.10 due to the relatively small sample size when year and origin farm were considered. Morbidity during the backgrounding phase was significantly higher (P<0.10) when the time between initial and booster vaccination was less than 14 days. No morbidity differences were found based on weaning time or the proximity of the final vaccination to commingling. Our results illustrate that the timing of vaccinations influences health outcomes of preconditioning programs, and that further research is necessary to provide definitive recommendations regarding timing of vaccination and weaning.
机译：牛呼吸系统疾病是断奶后犊牛中最常见的疾病，并且已经设计了许多预处理程序来减轻这种疾病综合征的影响。预处理程序依靠适当的工具实施（包括疫苗接种和断奶）来准备小腿成功地克服疾病挑战。我们的目标是确定背景发病率是否与先前接种疫苗的时间以及在牛饲喂牛犊混合之前断奶的天数有关。在六年的时间内从85个生产商那里获得了数据，这些生产商对犊牛进行了预处理，并将它们放在混合的背景中约三个月。利用广义线性混合模型来评估第一次和第二次病毒接种之间的天数，最终病毒疫苗接种和混合之间的天数以及混合之前的断奶天数的影响。由于考虑年份和来源农场时样本量相对较小，因此使用P <0.10进行假设检验。当初次和加强疫苗接种之间的时间少于14天时，背景阶段的发病率明显更高（P <0.10）。根据断奶时间或最终疫苗接种的混合性，未发现发病率差异。我们的结果表明，接种时间会影响预处理程序的健康结果，并且有必要进行进一步的研究以提供有关接种时间和断奶时间的明确建议。

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