- Boar: adult male pig kept for breeding purposes
- Farrow: to give birth
- Gilt: female pig that has not farrowed
- Litter: group of piglets born at one time from the same sow
- Piglet: newborn pig, weighs 1-2 kilograms
- Runt: smallest piglet in the litter
- Sow: adult female pig (Note that sow rhymes with cow!)
- Heat: the time when the gilt or sow accepts the boar for copulation