Okay so I recently just finished welding a 4 tier metal rat rack together at work and the tubs are the medium sized concrete mixing tubs from home depot (27.5" x 20"). I currently have 11 females & 6 males total. 2 tubs have 1:4 ratio's and the other 2 bins are separated by sex because the females aren't ready yet. I have 2 males that are ready now and 2 small males that will replace the bigger ones when they are ready and when all is said and done I plan on having 1:4 ratio's in each tub. What I would like to know is will 16 female rats be enough to feel my BP collection? I only have 3 BP's under 800g one being a 2 month hatchling, the other 2 being over 250g and my biggest is 1800g. I like to offer feeders weekly regardless if their taken or not and I don't plan on holding any ratties back unless their's a female that has a cool looking pattern. Is there a generalized rat breeding ratio per BP? Any help and advice will be greatly appreciated.