What do farmers keep to give birth to and care for new pigs?

The correct choice is sows, as they are the female pigs specifically bred for reproduction. Sows are responsible for giving birth to and nurturing new piglets. They undergo a gestation period and can give birth to a litter of piglets, providing them with the necessary care and milk needed for their first weeks of life.

Boars, which are male pigs, are primarily kept for breeding purposes but do not give birth or care for the piglets themselves. Hogs is a general term that refers to domesticated pigs and does not specifically indicate those that give birth. Piglets are the offspring of sows and are not capable of reproduction or care for themselves immediately after birth. This distinction is crucial in understanding the roles within pig farming.