Pig sperm usually survive in the uterus for more than 24 hours. When the pig's sperm and egg combine to form a fertilized egg in the pot-belly of the fallopian tube, it undergoes active cell division on the one hand, and on the other hand, it passes through the fallopian tube to the uterine junction, and gradually migrates downward to the uterine cavity, at which time the fertilized egg begins to further differentiate and reproduce, and takes root and reproduces in the uterus.

In order to expand the use of boar semen, solve the problem of sows inconvenient to artificial insemination station, eliminate the spread of disease, blood renewal of the herd and so on, semen transportation has become an indispensable link to ensure the smooth progress of artificial insemination.

The pig is an omnivorous mammal with a fat body, short limbs, a long nose and muzzle, a docile character, a strong adaptability and a fast reproduction. There are black, white, soy sauce red or black and white flowers and other colors. 5 to 12 months after birth can be mated, the gestation period of about 4 months, the average life expectancy of 20 years.