Final answer:
A young female swine yet to have offspring is referred to as a gilt. This term is specific to pigs and distinguishes them before they become sows, which are mature female pigs that have given birth.
Step-by-step explanation:
A young female swine that has not produced offspring is called a gilt. Swine, the domestic hog or a wild pig, have specific terms that distinguish between their ages and reproductive statuses. Pigs have a relatively short gestation period of about 114 days, and they can be bred to produce litters of piglets multiple times a year.
In contrast to mammals that may have unique reproductive methods, such as certain fish or insects engaging in parthenogenesis, a process where offspring can develop from unfertilized eggs, domestic pigs reproduce through sexual reproduction, requiring both a male and a female. Goats, another type of livestock, are known for their breeding habits; they typically produce offspring after the first year, much like pigs. Nonetheless, the terminology for young female livestock prior to giving birth varies across species; for example, a young female goat is called a doeling until she has kids.