Need help with breeding rats...

How many birthing tubs do you use with 23 racks going?

I have 80 birthing tubs to date. More will come when I have time to build them. I changed standard mortar tubs to 3x2 size(for my breeding tubs). That change has eaten most of my time and resources since the economy has taken a HUGE dive.

OK, I realize that this is a little old but I had to update :) Since posting this I have built a 28 bin maternity rack using the Medium Petmate Litter pans. I've been pulling the moms and placing them individually in the rack as soon as I see that they are showing. This change alone has had a tremendous impact on the survival rates of the babies. I'm reasonably confident that I have not lost any babies since placing the moms into the birthing racks:) I have also started to rotate the females through the male bins as I pull the preggo moms and replace with moms that have weaned off their babies. Otherwise, I still have kept the garage at 65 degrees and continued to feed the DoggyBag dog food from Tractor Supply.

Thanks again for the advice

Now you just have to start thinking about your replacement strategy. I try to replace 1/3 of my breeding animals at once. If you replace 1/3 of your animals every 16 weeks you will replace your animals once every 48 weeks (or about once a year). To me, this seems like the most logical way to do it. Feel free to weigh in on this one.

Are moms that are eating babies, have been eating babies from start or has that just began?