批次生产时母猪淘汰的管理 - 闫之春.pdf

Manage Sow Culling for Precision Batch Production 批次生产时母猪淘汰的管理 Jason ZC YAN 闫之春 提纲Outlines • 研究目的Objectives • 文献综述 Literature review • 结果讨论 Results and discussion 母猪更新淘汰的目的Why we should replace culled sows timely? • (被动地)更新死亡/外伤母猪，保证配种批次满负荷、连续稳定达到配 种目标；Replace involuntary culling, meet batch sow breeding goal; • (主动地)淘汰低效率母猪，提高繁殖效率；Voluntarily culling sows to improve sow herd efficiency; • 同时，at the same time, • 将母猪被动(死亡)淘汰降至最低，保持合理的主动更新比例；平衡母 猪更新成本vs母猪群效率最佳; minimize involuntary culling and maintain reasonable voluntary replacement rate; optimize sow herd efficiency over replacement cost; • 参配进群的后备能生产3+胎; Strive to let as many as verified, bred gilts reach 3+ parity 母猪更新淘汰的目的Always weight benefit over cost: cull? Not cull? 更高成本added cost 更好效果added benefits •多淘汰母猪more sows culled •分娩率 better farrowing rate •产仔数 larger litter size 适当的淘汰标准 proper culling criteria 后备母猪质量价格gilt quality and cost 仔猪价格weaner price 更低成本 reduced cost 降低效果reduced benefits •少淘汰母猪 less sows culled •分娩率 lower farrowing rate •产仔数smaller litter size 损失曲线：母猪的更新成本 Loss Function ：A mathematic equation to evaluate sow culling benefit: cost • 田口玄一（Genichi Taguchi）质量损失曲线. Losses of `quality` 损 失 增 多 猪群效率降低 herd efficiency 更新成本增加 replacement cost increases decreases Under-culling 更新过少 多过新更 Over-Culling 需要更新：P6+老龄母猪的产仔及其后代仔猪的表现 Rational to cull P6+ older parity