I have a pastel female produced in Oct 2004. She has never eaten anything other than mice. Her mass peaked at 1700 grams in Dec 2005, she has ovulated and will hopefully be producing some supers for me this year (currently at 1550 grams). So, to answer the OPs question, no, balls do not get big on mice...lol.

BTW she eats 5-10 mice per week. I fully expect her to hit 3000 grams by next year...
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when life hands you lemons, make super lemons, bumblebees, etc...

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