You want to buy animals that are about 4 to 6 weeks old, weaned to small and raise them to breeder size.
Ideally you want to buy them from a breeder but if you can't a pet store will do, I have built my entire colony with pet store animals to get to what it is now.(producing 5k to 10k of feeders a year). Takes time but it's possible
Avoid adults and proven breeder simply because their prime for breeding is likely over with
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