关键词: 经济效益, 生产系统, 灵敏性分析, 差额法

Abstract: [Objective] This paper aims to analyze three kinds of pig production system of Sichuan province,regarding to DLY,PIC and Local hybrid economic benefit.[Method] Profit equation is established to compute and compare the economic benefits of each production system,in the meantime to analyze the sensitivity of factors that influence each system by using the difference method.[Results] Results suggest that economic benefit of the three systems are PIC 375.72 yuan,which is higer than those of DLY 336.81 yuan,and local hybrid 273.31 yuan respectively.Besides,they indicate that the important factors affecting system are feed prices and feed conversion rate ofcommercial fattening period,incubation period as well as the conservation period;feed prices and feed conversion rate;commercial survival rate of breastfeeding;parents generation sow gestation feed prices;parents generation sow produces tire,parents generation sow singletons number born alive as well as hog prices.[Conclusion] The PIC system obtains the highest economic benefits,this study analyzes not only the factors those influencing pig economic benefit system itself,but also the influence of market on economic benefits,which can provide certain reference for the Sichuan pig production.

Key words: economic benefit, production system, sensitivity analysis, difference estimation