...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Animal >Modelling batch farrowing management within a farrow-to-finish pig herd: influence of management on contact structure and pig delivery to the slaughterhouse
【24h】

Modelling batch farrowing management within a farrow-to-finish pig herd: influence of management on contact structure and pig delivery to the slaughterhouse

机译：在分娩至成年的猪群中模拟分批分娩管理：管理对接触结构和生猪屠宰场的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pathogen spread within pig host populations can vary depending on within-herd interactions among pigs also called the contact structure. The recommended batch farrowing management, allowing for a fixed-interval mating for groups of sows of equal size, called batches, leads to an all-in/all-out management of pigs in which animals in different batches have no contact. To maintain a profitable pig delivery, producers have to deliver groups of pigs at a given weight, what needs sometimes herd management adaptations. However, producers' adaptations that avoid delivering pigs below slaughtering weight (out-of-range pigs), result in increasing the contact between animals from different batches. To study the influence of herd management on contact structure and on pig delivery a stochastic mathematical model representing population dynamics within a farrow-to-finish herd was elaborated. Sixteen management systems were represented combining or not the all-in/all-out management system with producers' decisions: batch mixing, use of an extra room, suppression of the drying period and sale of post-weaning batches. Two types of contact were considered: via the animals themselves, when batch mixing occurred; and via the room, when decontamination was not complete. The impact of producers' decisions on contact structure and on pig delivery differed radically when pig growth was normal and when it was slow (i.e. mean age at slaughtering weight increased by 20916). When pig growth was normal, the all-in/all-out management prevented both contact via the animals and via the room but resulted in 9% of pigs delivered out of range. The use of an extra room or batch mixing decreased this percentage, the latter resulting in very frequent contact between batches via the animals. When pig growth was slow, the all-in/all-out management led to a very high percentage of pigs delivered out of range (almost 80%). The suppression of the drying period at the end of the finishing period and the sale of post-weaning batches induced a significant decrease in this percentage (down to 2% to 20%), the latter allowing to reduce the percentage of batches that made contact via the room (40% instead of 80%). This pig herd model helped to understand the compromise for producers between implementing internal biosecurity or maintaining a profitable pig delivery. Our results show that there was no unique optimal system and that efficient producers' decisions (for biosecurity and delivery) may differ, depending on pig growth.
机译：病原体在猪宿主种群中的传播取决于猪之间的群内相互作用（也称为接触结构）而有所不同。推荐的分批分娩管理，允许将相同大小的母猪群以固定的间隔交配，称为分批，从而实现了对猪的全进/全出管理，其中不同批次的动物没有接触。为了维持有利可图的生猪交付，生产者必须以给定的体重交付成组的生猪，这有时需要适应畜群管理。但是，生产商的适应措施避免运送体重低于屠宰体重的猪（超范围的猪），从而增加了不同批次的动物之间的接触。为了研究畜群管理对接触结构和生猪分娩的影响，建立了一个随机数学模型，该模型代表了从分娩到成群的畜群内的种群动态。代表了16种管理系统，该系统将是否采用全进/出全管理系统与生产者的决定相结合：批次混合，使用额外的房间，抑制干燥时间以及断奶后批次的销售。考虑了两种类型的接触：当发生批次混合时，通过动物本身进行接触;并通过房间进行净化工作。当生猪生长正常和生长缓慢时（即，宰杀体重的平均年龄增加了20916），生产者的决定对接触结构和生猪交付的影响完全不同。当猪的生长正常时，全进/全出管理可防止通过动物和通过房间的接触，但导致9％的猪超出范围。使用额外的房间或批次混合降低了该百分比，后者导致批次之间通过动物非常频繁地接触。当猪的生长缓慢时，全进/全出管理会导致很大比例的猪出栏（几乎80％）。结束期结束后对干燥期的抑制和断奶后批次的销售导致该百分比显着下降（下降至2％至20％），后者可以减少接触的批次的百分比通过房间（40％而不是80％）。这种猪群模型有助于了解生产者在实施内部生物安全性或维持有利可图的生猪交付之间的折衷方案。我们的结果表明，没有独特的最佳系统，有效的生产者的决策（关于生物安全性和交付）可能会有所不同，具体取决于生猪的生长。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号