A two-stage stochastic programming model for scheduling replacements in sow farms

作     者：Rodriguez, Sara V. Albornoz, Victor M. Pla, Lluis M. 

作者机构：Univ Tecn Federico Santa Maria Dept Ind Santiago Chile Univ Lleida Dept Matemat Campus CappontC Jaume 273 Lleida 25001 Spain Univ Tecn Federico Santa Maria Dept Ind Santiago 6400 Chile 

出 版 物：《TOP》 

年 卷 期：2009年第17卷第1期

页      面：171-189页

核心收录：

学科分类：0202[经济学-应用经济学] 02[经济学] 020208[经济学-统计学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 07[理学] 0714[理学-统计学（可授理学、经济学学位）] 

主　　题：Replacement Planning Stochastic programming Sow herd management 

摘      要：This paper presents a formulation and resolution of a two-stage stochastic linear programming model with recourse for sow farms producing piglets. The proposed model considers a medium-term planning horizon and specifically allows optimal replacement and schedule of purchases to be obtained for the first stage. This model takes into account sow herd dynamics, housing facilities, reproduction management, herd size with initial and final inventory of sows and uncertain parameters such as litter size, mortality and fertility rates. These last parameters are explicitly incorporated via a finite set of scenarios. The proposed model is solved by using the algebraic modelling software OPL Studio from ILOG, in combination with the solver CPLEX to solve the linear models resulting from different instances considered. The article also presents results obtained with previous deterministic models assessing the suitability of the stochastic approach. Finally, the conclusions drawn from the study including an outlook are presented.