And Littleindiangirl, I read your posts in the sticky and am somewhat confused about your method as well. You talk about the cycle of moving males from one female to the next every two weeks, but you also state that you use concrete tubs with 1.3 I believe. Could you clarify a bit for me? If you move a male on a cycle of 2 weeks through 0.3 tubs, are you letting the females all give birth in the same concrete tub? But if you do only have 1 female per tub like the graph shows what happens if one of the females doesn't get pregnant in the two weeks allowed... You just don't have the litter that week that you are counting on?

Littleindian girl, I like yours because if one female is kept per bin it would be very easy to keep track of who's producing and how old they are, but it seems that this would take up alot of space and if a female missed getting pregnant or had a low number in her litter your numbers would be greatly affected that week.
I'm not sure where you read that I move the males, please link me maybe?

I do it much like RDR. The males get 1-3 (or 4) females in each breeding tub. The females can be rotated each week through the males like RDR does it, or left in with one male the entire 3 weeks they breed.

After she has been with him for three weeks, she is pulled and put in a maternity tub and nurses by herself until she weans. Rinse and repeat.

I always keep females by themselves, I like to have complete control and know what females are better at production and nursing. I also record how many pinks from each female. This way I hold back grow up females from high production lines.

Missing a litter is just something to deal with if you are using a tight schedule and minimum number of females. Obviously if you have room to spare, throw in more than you need. You can always gas and freeze extra!