SWINE: Definitions of Use Class | PORCINOS
Intact, sexually mature, male pigs intended for breeding purposes; generally not intended for slaughter in the U.S.
Castrated male pigs intended for slaughter.
Female pigs that have not farrowed a little and are intended for slaughter or breeding purposes.
Breeding female pigs that have not farrowed a litter; usually weigh 220-300 lb (100-135 kg).
Female pigs that have farrowed one or more litters.
Pigs from birth until weaning that are currently nursing.
Starter or Nursery Pigs
Boars, barrows and gilts from approximately 2-4 weeks of age and approximately 50-60 lb (23-27 kg).
Barrows and gilts from approximately 50-60 lb (23-27 kg) to 120-150 lb (55-68 kg).
Barrows and gilts from approximately 120 to 150 lb (55-68 kg) to market weight for slaughter.