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A simulation study of the efficiency of swine production systems.

机译：养猪生产系统效率的模拟研究。

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摘要

A discrete, event-driven, and stochastic swine production model for personal computer use has been constructed and validated. This model is sufficiently flexible to be used for farms over a wide range of biological variables and management policies. Simulated data are compared to actual performance of 20 farms in the PigCHAMP information system. Correlation analyses of nine tested output variables were found to have R{dollar}sp2{dollar} between 87% and 99%. Results of a parametric (regression) test and a non-parametric (Wilcoxon's signed rank) test indicated that the model has the capability to simulate the actual farms with reasonable accuracy.; This model was then used to study the production efficiency of farrow-finish operations under various biological changes and management alternatives. A fractional factorial experiment with 17 factors was chosen to produce data of 512 simulated farms over a 2-year period after a pretrial warmup period of 10 years. The farms were high investment, confinement, environmentally controlled, with 120 breeding sow capacity.; Statistical analyses were performed to study: (a) the relative importance of the seventeen factors (b) the impact of improving each factor and (c) the connection between productivity and profitability. Strategy evaluation on a sample farm was also demonstrated.; Livebirths per litter and preweaning mortality were found to be the two most important factors for production efficiency. The Feed:Gain ratios of finisher and grower were ranked as the 3rd and 4th important factors for net return per sow per year. Consideration of post-weaning factors such as pig mortality and feed efficiency were necessary to fulfill the connection between productivity and profitability. The importance of factors related to sow longevity were also discussed.
机译：建立并验证了用于个人计算机的离散的，事件驱动的和随机的生猪生产模型。该模型具有足够的灵活性，可用于具有广泛生物变量和管理政策的农场。在PigCHAMP信息系统中，将模拟数据与20个农场的实际性能进行了比较。对9个测试输出变量的相关分析发现R {dollar} sp2 {dollar}在87％至99％之间。参数（回归）检验和非参数（Wilcoxon签名秩）检验的结果表明，该模型具有以合理的精度模拟实际农场的能力。然后，使用该模型来研究在各种生物变化和管理替代条件下的分娩完成作业的生产效率。在进行了10年的审前预热期之后，选择了包含17个因素的分数阶乘实验，以在2年内生成512个模拟农场的数据。这些农场投资高，禁闭，环境受控，有120头种猪。进行了统计分析以研究：（a）十七个因素的相对重要性（b）改善每个因素的影响，以及（c）生产率与盈利能力之间的联系。还演示了对样本农场的策略评估。发现每窝产仔数和断奶前死亡率是提高生产效率的两个最重要因素。育肥者和种植者的饲料：增重比被列为每年每头母猪净收益的第三和第四重要因素。必须考虑断奶后的因素，例如猪的死亡率和饲料效率，才能实现生产率和获利能力之间的联系。还讨论了与母猪寿命有关的因素的重要性。

著录项

  • 作者

    Lu, MingYu.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Agriculture Animal Culture and Nutrition.; Biology Biostatistics.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 94 p.
  • 总页数 94
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 饲料;生物数学方法;
  • 关键词

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