RDR has his set up with the breeders in the litter pans, and the mothers raising in small pans. The only thing I have against his set up, is he is using mouse breeding tubs as female nursing racks, and these are incredibly short and cramped.

I would use the concrete as breeding, and the litter pans as nursing. It's how we do it and it works out well, without leaving the female and her young hardly able to turn around.

RDR has a lot of videos on how he does it. He puts girls in to breed, then he pulls them into the nursing tubs, and when they wean he puts them back in to breed.

I must point out, there is no evidence to support that a female bred back to back (i.e., not removed from males, litter every 3-4 weeks) will grow larger on a linear scale with the increase in her litters. Female rats will grow based on genetics, I can't say in all of my readings that I have ever come across his idea or anything to support it.

I like the RDR method far better than allowing females to have a litter every 3-4 weeks. Some people do it this way though, which I believe is what Suzuki is referring to. (I think, I'm unsure of what he does). I personally disagree with that method,... call it the animal lover in me.