In which case would the term 'gilt' apply?

The term 'gilt' specifically refers to a young female pig that has not yet had piglets. This terminology is commonly used in the swine industry to classify pigs based on age and reproductive status. Understanding such terms is essential for effective communication in agricultural settings, particularly when discussing breeding and livestock management.

The other choices do not accurately reflect the term 'gilt.' A female sheep is referred to as a ewe, an adult cow is called a heifer if it has not yet calved, and a male goat is termed a buck. Therefore, 'gilt' is uniquely appropriate for describing a young female pig, highlighting its exclusive use in swine terminology.