Solution
First, ensure that you enable the option to record the person involved in the mating:
One-time setup:
[1. Animal records] - [12. Settings]
'Input' tab
Check the box for 'Record person involved in mating'
Click [OK] to save
You can now record the inseminator when entering a mating record
Retrieving mating result analysis:
[2. Analysis] - [5. Boar mating analysis] - [1. Mating results]
Select the correct person under 'Person involved in mating'