Go to the menu Sows boars and select Abortion – enter sow number and date. Alternatively the abortion could be registered on the sow card, if the columns are there, if not they have to be added to the layout. 

If you wish to add piglets to the aborted animal, tick the box called Nursing sow and then use Transferred piglets to enter how many piglets have been moved onto her. PigVision will now expect her next event to be entered will be a weaning.