Which of the following is a term for a female pig?

The term "sow" specifically refers to a female pig that has given birth, distinguishing it from other classifications of pigs such as gilts, which are female pigs that have not yet had offspring. This precise terminology is important in livestock management and breeding.

In comparison, the other terms refer to different categories within swine. A gilt is a young female pig that has not yet given birth, while a barrow is a castrated male pig, and a boar is an uncastrated male pig. Recognizing these distinctions helps in understanding pig breeding, production, and animal husbandry practices, making "sow" the correct choice in identifying a female pig.