For balls I think people normally stop at medium rats.
I would imagine a large rat would only be for the extremely large girls.
This is just how I do it, but for me I feed the balls the 15% rule every 5 days until they are 750g. From then on I feed a small or medium rat every 7 days
Also, I have a 1300g female that is 3 years old. She has ate perfectly her whole life, some are just smaller
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