Question: how many mice die on average every week?

Helen Cooper answered on 22 Jun 2018:

Hopefully only a small number of mice will die each week from natural causes. We hopefully spot any sick ones before they get that bad!

At the end of studies we may need to put the mice to sleep to take samples from them; but this number will change each week depending on how many studies we have.

Sorry I can’t give you an exact answer!