生猪价格频繁的波动及挥之不去的猪周期曾经让各界为之头疼,不过,随着规模养殖的不断发展,猪周期正在发生变化。近两年,随着生猪养殖的环保政策越来越严峻,多数养猪场面临搬迁、拆迁。尤其是南方水网地区优化生猪养殖区域布局,对浙江、福建、湖南等地区冲击很大,2015年仅福建省拆迁的养猪场就高达1.3万家,散养户的数量越来越少。同时对能繁母猪及生猪 Frequent fluctuations in hog prices and lingering cycles of pigs have given the community a headache, however, with the continuous development of large-scale farming, the swine cycle is changing. In the past two years, as the environmental protection policy of pig breeding becomes more and more serious, most pig farms are faced with relocation and demolition. In particular, optimizing the layout of pig breeding areas in the southern water network has a great impact on Zhejiang, Fujian and Hunan. In 2015, only 13,000 pig farms were relocated in Fujian Province, and the number of free-range farmers was decreasing. At the same time to sow sows and pigs