Here's what happened:

In the first 100 days the mice adjusted themselves to the new environment without predators and abundant water and food. Territories and nests were made in this period.

After that the first days the population doubled every 60 days for 200 days. Food distribution became unequal though each living unit had the same amount of supplies.
Mice ate with others as the population increased and some units became crowded.

The next 300 days the population was levelling off (not growing nor shrinking), violence became common searching for acceptance.
Some mice became targets of attacks and other mice only spent time on eating sleeping and drinking, they never involved themselves with other mice.

The last period declined even before