Pigs are estimated to have evolved about 38 million years ago in central Europe, and about 25 million years ago to have become established in Africa and Asia. Pigs became domesticated in China about 5000 b.c.e. The reason for the delay in agricultural domestication is believed to be that pigs were unwilling to adapt to a nomadic lifestyle, as dogs, sheep, and goats did. The domesticated pig is thought to have descended fromtwo different lines of wild hogs. It is believed that the East Indian pig (Sus vittatus) has had major influence on the swine of China and the surrounding region. The European wild boar has probably had major influence on the rest of the various breeds of pigs in the world. The domestic pig is a compact, solid-looking animal with a large head, short, fast-moving legs, a rough coat, and a small tail. The color of a pig can vary greatly, fromwhite or black to brownish-red, and any combination thereof, including spotted, solid colored, and banded. Some may reach a height of only twelve inches at the shoulder, others may reach all the way to four feet. The weight of a pig also can vary, with some weighing only about 60 pounds, where others can go over 900. The average meat pig falls in the range from225 to 300 pounds. Humans use pigs in many different ways. From the point of view of the percentage of the carcass used, the pig is the most utilized of all domesticated animals. The hair is used for brushes because it is very strong, yet flexible. The hide is used for numerous products, from shoes to purses; in general it is lightweight and durable. The blood and offal are used for fertilizers, soaps, and medical supplies. Domestic pigs have been used by mankind for centuries as a main supplier of dietary protein.
Thanks for description - Animal life club