Terminologies Used in Pig Farming.

Pig, hog, or swine, the species as a whole, or any member of it. The singular of "swine" is the same as the plural.
Shoat, piglet, or (where the species is called "hog" pig, unweaned young pig, or any immature pig
Sucker, a pig between birth and weaning
Weaner, a young pig recently separated from the sow
Runt, an unusually small and weak piglet, often one in a litter
Boar or hog, male pig of breeding age
Barrow, male pig castrated before puberty
Stag, male pig castrated later in life (an older boar after castration)
Gilt, young female not yet mated, or not yet farrowed, or after only one litter (depending on local usage).
Suckling pig, a piglet slaughtered for its tender meat
Feeder pig,

a weaned gilt or barrow weighing between 18 kg (40 lb) and 37 kg (82 lb) at 6 to 8 weeks of age that is sold to be finished for slaughter
Porker, market pig between 30 kg (66 lb) and about 54 kg (119 lb) dressed weight
Baconer, a market pig between 65 kg (143 lb) and 80 kg (180 lb) dressed weight. The maximum weight can vary between processors.
Grower, a pig between weaning and sale or transfer to the breeding herd, sold for slaughter or killed for rations.[clarification needed]
Finisher, a grower pig over 70 kg (150 lb) liveweight
Butcher hog, a pig of approximately 100 kg (220 lb), ready for the market. In some markets (Italy) the final weight of butcher pig is in the 180 kg (400 lb) range. They tend to have hind legs suitable to produce cured ham
Backfatter, cull breeding pig sold for meat; usually refers specifically to a cull sow, but is sometimes used in reference to boars
Sow, breeding female, or female after first or second litter
Herd, a group of pigs, or all the pigs on a farm or in a region
Sounder, a small group of pigs (or wild boar) foraging in woodland
Trotters, the hooves of pigs (they have four hoofed toes on each foot, walking mainly on the larger central two)
In pig, pregnant
Farrowing, giving birth
Hogging, a sow when on heat (during estrus)
Sty, a small pig-house, usually with an outdoor run or a pig confinement
Pig-shed, a larger pig-house
Ark, a low semi circular field-shelter for pigs
Curtain-barn, a long, open building with curtains on the long sides of the barn. This increases ventilation on hot, humid summer days