I went through a number of sites about pigs, including a long detailed one about potbellied pigs as pets.
I found a number of terms I had forgotten. Birth of litter is called "farrowing". A young male that has been castrated is called a "barrow". A female is a "gilt" until her second pregnancy. The genus is Sus scrofa. The "scrofa" reminded me of "scrofula" a condition that afflicted lexicographer Sam Johnson, in which tuberculosis causes lymph glands in neck to enlarge greatly, and sometimes become open sores.

One more time: hogs are mature animals ready for market, and no boars are wanted.

I just remembered that scrofula was also called "King's Evil" in belief that the touch of the King could cure it.