It is referred to as farrowing as another name for piglets is farrow.
Parturition, or the act of giving birth.
In horses, parturition(the birthing process) is often called "Droping the foal."
Calving.
childbirth
Parturition
Parturition
A young female pig (swine) is referred to as a "gilt" - until after her first pregnancy (or litter of pigs/piglets). After giving birth (parturition) from her first pregnancy, a female pig (swine) is thereafter referred to as a "sow".
Whelping or parturition.
parturition labor
Calving, or giving birth.
Young swine are called piglets.
A swine offspring is called a piglet.