How often do you want a litter, every week? And how many litters do you want per week?
Say you want 3 litters every week.
3 females per tub. You have 12 tubs (1-12) and assume you have 2 males (M1 & M2).
Assign the males there own tubs. i.e. M1 gets tubs 1-6 and M2 gets tubs 7-12.
Rotate the males through the tubs so that they spend two weeks with each set of females. If you stagger the rotation so that M1 moves one week and M2 the next you'll get litters every week. If you move them at the same time you'll get 6 litters every two weeks.
Never place both males in the same tub!
This system has the advantage of producing constantly while allowing the females vacation time after each litter. You can do this with a few as 4 tubs per male (any fewer tubs than that the male arrives to early in tub #1 when the cycle repeats) So if you want to use 4 tubs per male (8 total) and keep the remaining 4 tubs for grow outs you can.
I use this method with my mice and it works great! And will be easier with rats.
Hope it wasn't too confusing. Feel free to ask Q's.
Also heres a more comprehensive post of my method:
http://www.ball-pythons.net/forums/s...ad.php?t=77619
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