I like pig farming. It is the raising and breeding of domesticated pigs
Cool! I always wanted to have a farm at some point in my life. Is it challenging? 
Yes, it is not easy. Pigs are farmed solely for human consumption 
True, I don't know anyone drinking pig milk! Although I heard of a few people having them just as pets. But I guess when it gets old, they will have to put it down and get lots of bacon.
Pig farming
Pig farming is the raising and breeding of domestic pigs as livestock, and is a branch of animal husbandry. Pigs are farmed principally for food (e.g. pork, bacon, gammon) or sometimes skinned.
Pigs are amenable to many different styles of farming: intensive commercial units, commercial free range enterprises, or 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 owner's house). Historically, farm pigs
cheese, which is sometimes known as brawn. Liver, chitterlings, blood (for black pudding), and other offal from pigs are also widely used for food. In some religions, such as Judaism and Islam, pork is a taboo food.
The use of pig milk for human consumption does take place, but as there are certain difficulties in obtaining it, there is little commercial production.
Livestock pigs are exhibited at agricultural shows, judged either as stud stock compared to the standard features of each pig breed