Oh wow, that involves math somehow! Haha, I would get the young rats as soon as possible as it doesn't seem like you have months worth of mice left, but merely weeks.
Females really need to be 5 months of age for breeding, and when they arrive in stores like Petco, they are usually 6-7 weeks of age. So you'll have possible 3 -4 months before they are ready to breed.
If you weigh them, they should weigh over 250 grams to breed.
I hope that answered you question! Forgive me if not, it's a Monday.![]()









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