A sire can be added via the Add/Edit Animal screen (of any animal), in the Birth Details section, by clicking on the + button beside the entry point for Sire.
Any animal added this way is for pedigree purposes only , and will be Inactive .
Such animals will NOT appear as live animals in your herd.
If you have added a sire incorrectly and you wish to delete it from your list of pedigree sires, use the following steps:

Step 2. Enter the Identification of the sire to be deleted.
In the Search For Animal box at the top left of the Animals screen, type in the Identification of the Sire you wish to delete.
Similarly, click on the Filter button (top right hand side of Animals screen) and under Sex , tick Males and tick the Must be Pedigree Only check box.
Then click OK button. (This is another option if you can't remember the Identification you entered for the erroneous sire.)

Step 3. Highlight the animal to be Deleted