Personally, I never use age when defining whether or not my rats will breed. If my males are over 200g, and my females are over 250g, I put them in a program. If you breed them too soon, you may get litters of stillborn babies, small litters, deformed litters or a shortened breeding life out of your females. I would keep the ones you've got, because they'll be big enough soon, and get a few others from the pet store, or better yet, from a friend or someone who already breeds rats.
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