An analysis of mortality in the grower/finisher phase of swine production in the United States
An analysis of mortality in the grower/finisher phase of swine production in the United States
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DOI：
10.1016/s0167-5877(97)00052-4
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发表时间：
1998-01-01
影响因子：
2.6
通讯作者：
Corso, BA
中科院分区：
文献类型：
--
作者：
Losinger, WC;Bush, EJ;Corso, BA
在6个月的时间里，种植者/育肥者生产阶段的平均死亡风险(基于参与美国国家动物健康监测系统1995年国家生猪研究的393家企业，代表16个州300个市场沼泽以上的企业)为2.3+/-0.2%(其中+/-之后的数字代表估计的标准误差)。13.5+/-2.9%的育种者/育肥者手术的死亡率大于或等于4%，而63.6+/-5.3%的种植/育肥者的死亡率小于或等于2%。为了确定死亡率大于或等于4%的相关因素，逐步Logistic回归[统计分析系统，1989。SAS/STAT(R)用户指南，版本6，第4版，第2卷。SAS Institute，Cary，NC，794页。]进行了两次手术：一次是使用所有死亡率的手术，另一次是排除死亡率在2%到4%之间的手术。最终模型用SUDAAN[Shah，B.V.，Barnwell，B.G.，Bieler，G.S.，1996]运行。SUDAAN用户手册，版本6.40，第二版。研究三角研究所，研究三角公园，北卡罗来纳州，492页。]考虑到样品的设计。此外，还建立了SAS和SUDAAN Logistic回归模型来分析与生长猪/育肥猪2.3%死亡率相关的因素。在所有模型中，平均断奶年龄小于或等于28天与饲养者/育肥者单位的死亡率增加有关。没有从属于该操作的分娩单位获得所有的生长/育肥猪与生长/育肥猪的死亡率大于或等于4%相关。通常不在饲料或水中给予生长/育肥猪抗生素或其他制剂作为疾病预防或生长促进剂，并将生产者组织列为非常或极其重要的抗生素信息来源，与生长/育肥阶段的死亡率低于或等于2.3%有关。(C)1998年爱思唯尔科学公司。
Over a 6-month period, the mean mortality risk (based on 393 operations participating in the United States National Animal Health Monitoring System 1995 National Swine Study, and representing operations with greater than or equal to 300 market bogs in 16 states), was 2.3 +/- 0.2% in the grower/finisher production phase (where figures after the +/- represent the standard error of the estimate). Mortality greater than or equal to 4% was experienced by 13.5 +/- 2.9% of grower/finisher operations, while 63.6 +/- 5.3% had less than or equal to 2% mortality. To identify factors associated with greater than or equal to 4% mortality, stepwise logistic regression [Statistical Analysis Systems, 1989. SAS/STAT(R) User's Guide, Version 6, 4th edn, Vol. 2. SAS Institute, Cary, NC, 794 pp.] was performed twice: once using operations with all mortality rates, and again excluding operations with between 2% and 4% mortality. Final models were run with SUDAAN [Shah, B.V., Barnwell, B.G., Bieler, G.S., 1996. SUDAAN User's Manual, Version 6.40, 2nd edn. Research Triangle Institute, Research Triangle Park, NC, 492 pp.] to take the sample design into account. In addition, SAS and SUDAAN logistic regression models were developed to analyze factors associated with > 2.3% mortality among grower/finisher pigs. Mean weaning age less than or equal to 28 days entered all models as being associated with increased mortality in the grower/finisher unit. Not obtaining all grower/finisher pigs from farrowing units belonging to the operation was associated with greater than or equal to 4% mortality among grower/finisher swine. Not typically giving grower/finisher pigs antibiotics or other agents as disease-preventives or growth-promotants in the feed or water, and ranking producer organizations as very or extremely important sources of antibiotic information were associated with less than or equal to 2.3% mortality in the grower/finisher phase. (C) 1998 Elsevier Science B.V.