Within each livestock tracker settings, you're able to select to configure the weights for your selected stock type.
How to customise your weights for a particular type of tracker
You can customise the weights per year by using the year selector at the top of the configuration page.
From the configure weights page, you can hit Edit on any particular stock class and this will pull up options depending on the livestock tracker you're viewing
For cattle trackers you have the option to update the closing live weight, dress out percentage, and stock units per head per stock class.
Once done, hit Save and move on to configuring the other stock classes as desired.
For sheep trackers you have the option to update the closing live weight, dress out percentage, and dry sheep equivalent (DSE), per stock class.
NOTE: If you're a part of an organisation, you can instead choose to set and use organisation defaults for stock weights.