NOTE: This a UK only feature
It's easy to record calf birth without recording a tag for that animal first.
Follow these steps:
>Orange Plus Button(+)
>Pick the Sex
>Pick the Date of Birth
>Pick the Dam
>Pick the AI/Stock bull or alternatively just add the Sire Breed
> Add a Stillborn/Cause of Death
>Enter Date of Death
This will create a calving for that Cow so that she will appear in your breeding lists. It will also remove that calf from you Herd.