You can add cows to new and existing groups and remove them existing groups. You can also create and delete groups. Sorting your herd into groups has many farm management benefits which can be as simple as splitting your herd into different mobs for feeding or monitoring cows of interest throughout the season.
miHub has some groups that will change as the season progresses.
The system automatically determines which cows should belong in the group and puts them there.
For a list of these groups and what they mean please see
Rule Based Groups