Long-time back, the milk producing animals were kept under custody by people so that they can get milk from those animals for family and public. The nomadic herders used to take these animals along them to where ever they had to move. Even after so many advancements and civilizations, people buy dairy animals, keep them with themselves, milk them and get milk from them to serve their family and other villagers. The farmers used to feed the animals by themselves and early at that time, the number of animals not that much. However, as the world has started progressing towards industrialization, there was a need to establish a milk supply system as well.