Abstract:

Pig farming in large scale is the main way in nowadays and in future. It will increase the pig output
and decrease the price; however it will bring the environmental pollution and contamination. It learns from the
America’s experience and lessons in the pig farming in large scale of American. It proposes that it ’s important
to purification soil, air and water in the process of pig farming. It is a keystone to use excrement in cycle and
bioremediation. It also puts forward that it should control the pig scale and cost exteriorizations