To enter multiple breedings at the same time, do the following:

1. Find the animals to be bred in Animal List or any report.
2. Select all of the ones bred by using Shift-Click or Ctrl-Click
3. Right click > Batch Entry > Insemination
4. Set the parameters the same way as a single entry
5. Click Apply To All and then Save and Close

If different cows have different parameters (Semen, comment, date, etc.) these can be edited individually by clicking on the animal in the list at the bottom of window.