Nothing wrong with it I pretty much started with a small number making sure to get rats from different source to build my colony from scratch and make sure to produce the best of the best.

Selective breeding is very important with rats as well when it comes to litter size and behavior.

Just make sure to buy young rats (small about 6 weeks of age) and raise them up to optimum weight (250 grams). Buying adults, large rats or proven breeder often means they are no longer in their prime for breeding.

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