Solution
To use a new AI boar for mating, go to the screen where you enter mating details.
Enter the new AI boar in the 'Boar name' field.
Upon saving, the program will indicate that it is an unknown boar and ask if you wish to add it.
Tip! You can clean up your list of boars by blocking those that are no longer in use. To do this, go to [1.Animal Records] - [1.Data Entry] - [6.AI Boars].
Select the boar that is no longer in use and choose 'Block'.