Retrospective evaluation of excess death loss in feedlot cattle associated with in-feed tylosin application programs

S. Rutten-Ramos, S. Simjee, J. L. Bargen, G. Vogel
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引用次数: 1

Abstract

Daily feedlot records from steer and heifer lots slaughtered between January 2015 and December 2020 were evaluated for timing of tylosin programs and death events. Tylosin applications were described as Any/None (1/0) in the first 30 days-on-feed, Any in the middle feeding period, and Any/None (1/0) in the last 30 days-on-feed. The final analysis included 125,520 lots of cattle with 18,814,224 head placed. By year, week of the year, week on feed, sex type, hundred-weight at placement and tylosin program, weekly deaths were summarized as deaths per thousand head fed (Deaths_K). Using continuously fed tylosin lots as baseline for each summarized category, excess Deaths_K were calculated for each program. For each hundredweight group, mixed analysis of variance models were developed to assess differences in excess Deaths_K across tylosin programs. Overall, cattle not fed tylosin in the first 30 d in the feedlot experienced higher Deaths_K than cattle that were. Differences in excess death loss across tylosin programs were greater among cattle placed under 800 lb (363 kg) compared to heavier cattle.
回顾性评价超额死亡损失饲养场牛与饲料有关泰乐菌素应用程序
对2015年1月至2020年12月屠宰的阉牛和小母牛的每日饲养场记录进行了评估,以确定tylosin计划和死亡事件的时间。Tylosin在饲喂前30天为任何/无(1/0),饲喂中期为任何,饲喂后30天为任何/无(1/0)。最终的分析包括125,520头牛,18,814,224头。按年、周数、喂养周数、性别类型、饲养时百重和tylosin计划,每周死亡总结为每千头饲料死亡(Deaths_K)。使用连续饲喂的泰洛菌素批次作为每个总结类别的基线,计算每个程序的超额死亡s_k。对于每一英重组,开发了混合方差分析模型,以评估tylosin方案中过量Deaths_K的差异。总体而言,在饲养场前30 d未饲喂泰络菌素的牛比饲喂泰络菌素的牛有更高的Deaths_K。与体重较重的牛相比,体重在800磅(363公斤)以下的牛在tylosin项目中的超额死亡损失差异更大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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