How many snakes do you have? The hard part about breeding rats is getting a constant supply the right size without getting too big for your snakes. How many tanks / cages do you have? I'm actually going to a new system, I put a male and female together, then after a week add another female, and again the next week. Eventually I get the to the point where I'm adding a new female to my male tank every week and pulling one that's about to give birth. Takes at least 9 females, preferably more so that they can rest a few weeks between batches of pups. Then after three weeks the moms with remaining babies can be combined, the older babies put in separate tanks. Don't combine females with new babies until they are at least two weeks old. Right now your females may all give birth at once, then you'll only have a bunch at the same age. I did that feast or famine thing awhile until I came up with a plan. Your rats will be too small or too big, and with my plan you'll have every size you need. Just CO2 and freeze them when they max out in size.
Also, if you don't have enough rats for a system you may want to raise up most of the first babies until they mature, feed off the males and keep the the females you need. You may need to switch to frozen thawed until you get enough breeders of the right age. If you end up with too many rats you can feed multiple rats that a time that are smaller or feed several times a week.
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