Nadal-Roig E, Plà L M
Departament de Matemàtiques, Universitat de Lleida, Jaume II 73, E-25003 Lleida, Spain
Departament de Matemàtiques, Universitat de Lleida, Jaume II 73, E-25003 Lleida, Spain Agrotecnio Center, Universitat de Lleida, Av. Rovira Roure 191, E-25198 Lleida, Spain.
J Anim Sci. 2014 Sep;92(9):4154-60. doi: 10.2527/jas.2014-7784. Epub 2014 Jul 8.
This paper presents a multiperiod planning tool for multisite pig production systems based on Linear Programming (LP). The aim of the model is to help pig managers of multisite systems in making short-term decisions (mainly related to pig transfers between farms and batch management in fattening units) and mid-term or long-term decisions (according to company targets and expansion strategy). The model skeleton follows the structure of a three-site system that can be adapted to any multisite system present in the modern pig industry. There are three basic phases, namely, piglet production, rearing pigs, and fattening. Each phase involves a different set of farms; therefore, transportation between farms and delivering of pigs to the abattoir are under consideration. The model maximizes the total gross margin calculated from the income of sales to the abattoir and the production costs over the time horizon considered. Production cost depends on each type of farm involved in the process. Parameters like number of farms per phase and distance, farm capacity, reproduction management policies, feeding and veterinary expenses, and transportation costs are taken into account. The model also provides a schedule of transfers between farms in terms of animals to be transported and number of trucks involved. The use of the model is illustrated with a case study based on a real instance of a company located in Catalonia (Spain).
本文提出了一种基于线性规划（LP）的多地点生猪生产系统多周期规划工具。该模型的目的是帮助多地点系统的生猪管理者做出短期决策（主要涉及农场间的生猪转移和育肥单元的批次管理）以及中期或长期决策（根据公司目标和扩张战略）。模型框架遵循一个三地点系统的结构，该结构可适用于现代生猪产业中的任何多地点系统。有三个基本阶段，即仔猪生产、育肥猪饲养和育肥。每个阶段涉及不同的一组农场；因此，考虑了农场间的运输以及将生猪运往屠宰场的情况。该模型使在考虑的时间范围内从向屠宰场销售的收入和生产成本计算得出的总毛利润最大化。生产成本取决于该过程中涉及的每种类型的农场。考虑了诸如每个阶段的农场数量和距离、农场产能、繁殖管理政策、饲养和兽医费用以及运输成本等参数。该模型还根据要运输的动物数量和涉及的卡车数量提供了农场间转移的时间表。通过基于西班牙加泰罗尼亚一家公司的实际案例研究来说明该模型的使用。
