Things to take in consideration

You need to be able to produce without interruption

Rats produce between 6 to 12 babies per litter

Gestation is 21 days

Females will go through the following stage breeding, gestation, nursing.

A good rule of thumb is to have 1 female rat for every snake you own, if you have surplus euthanize them and either sell them or feed them to your snake that will take F/T