A female pig that has never had a litter of piglets is called a gilt, while a female pig that has had a litter is called a sow.
On pig farms, female pigs used solely for butchering are called gilts or butcher hogs. They will be butchered at 10 to 14 months of age. They will weigh from 195 to 300 pounds at slaughter.
Female pigs that will be used for breeding and expanding the pig farm are known as sows. They weigh from 300 to 700 pounds.
Male pigs are called barrows. Those used solely for meat are also called butcher hogs.