I disagree of course. Rats have roughly a 15-20 month "window" of optimum breeding life. If you allow for pregnancy, nursing and a rest period. You just used over three months for ONE litter. In the same three months, rats under my care would be working on their third litter. So even if you produce and sustain 200% more offspring than I can per litter, you are producing less than 1/3 of the litters.