This study was conducted to estimate the marginal profits of growth and reproduction traits of pigs in Beijing area. A farm model was constructed using balancing method and system analysis. The production of commercial pigs was simulated, and the related data was obtained from farms. The results showed that the marginal profits of production and reproduction traits were 20. 5 RMB for litter size born alive(pig/litter), ?. 3 RMB for days at body weight 100 kg (day), 0. 04 RMB for average daily gain(g ?d-1), ?86. 4 RMB for feed conversion efficiency (kg ?kg1),?5 RMB for carcass backfat thickness(mm), and 1. 8 RMB for sow reproductive longevity (litter). These results indicate that changes of the market prices affect the marginal profits of the traits investigated greatly.%本研究旨在估计北京地区猪生长和繁殖性状的边际效益.以差额法和系统分析法为基础建立农场模型,模拟商品猪群的生产过程,采集了北京地区多个具有代表性的猪场的数据,确定北京地区猪6个生长和繁殖性状的边际效益为:窝产活仔数(头)20.5元、达100kg体质量日龄(d)-0.3元、肥育期日增体质量(g·d-1)0.04元、饲料转化效率(kg·kg-1)-186.4元、胴体背膘厚(mm) 15元、母猪繁殖寿命(胎)1.8元.结果表明,市场价格的变化对性状边际效益的影响很大.
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