From Breeding list:

1.    Go to BREEDINGS at the top of the dashboard

2.    Find the breeding pair you would like to retire and click on it

• Select retire breeding

From MICE List:

1.    Go to MICE

2.    Select the breeding animal you want to retire from the list

3. Look at the “card” for Breeding at the bottom

4. Select the 3-dot menu and you can Retire the whole Breeding