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Anonymous
Yes, you'll need a separate cage. I can't remember for sure, but female rats cycle every four days or something like that, so if you want to make sure she gets pregnant, leave her in there with the boy for a week. By around 14 days, you can palpitate her midsection area and should be feeling little lumps the size of rice grains--those are her pups--and by 17 days it should be fairly obvious whether or not she's pregnant. She'll give birth at around 21 days, so you have quite a bit of a wait ahead of you if you do go about this route.
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