This article is from the Fall 1997 AFRMA Rat & Mouse Tales news-magazine.
How fast can mice multiply? Start with 2 baby mice, one of each sex. At 6 weeks old the female can become pregnant. Gestation is 3 weeks, and under optimal conditions the female can become pregnant again immediately after giving birth. Assume a litter of eight, four male and four female, which are paired and bred when they are 6 weeks old. Theoretically you could get:
|Week||Females X||Males =||Babies||Total Mice|
Yes, that’s over one hundred thousand mice in one year!
Caution: don’t try this at home.
How many more weeks will it take before you have over 1 million mice?
See answer here (put mouse over underline):
You will have over a million mice in only 9 more weeks!