Pig farming is the raising and breeding of domestic pigs. It is a branch of animal husbandry. Pigs are raised principally as food (e.g. pork, bacon, gammon) and sometimes for their skin.Pigs are amenable to many different styles of farming. intensive commercial units, commercial free range enterprises, extensive farming - being allowed to wander around a village, town or city, or tethered in a simple shelter or kept in a pen outside the owners house.