For your data to remain useful, you need to keep your mob counts up-to-date. There are a few ways you can do this using Livestock Activities:

1. If you have discovered dead animals, you can use the Found Dead activity to record this, and these will be deduced from your total. [Mob Management > Found Dead]

2. You could perform a Count activity [Mob Management > Count].

3. A number of additional Livestock Activities allow you to update the head count as part of the activity, for example Jet [Treatment/Provision > Jet]. Make sure you tick 'Update Mob Size' if you wish the new count to be saved.

Note: If you have multiple sexes in a mob, you will be asked to assign the sexes of missing animals.