However, the method of small-scale, scattered and intercropped farming in residential areas has many limitations, such as low productivity, difficult to control disease, environmental pollution,... To overcome these limitations, in recent years, the authorities from central to local levels throughout the country have issued policies on planning, encouraging and controlling pig production with the aim of bringing activities to Pig husbandry is developed according to the method of concentrated farm husbandry far from residential areas, towards more and more sustainable.