BEW mice?

I got one as a feeder. I was just wondering, how rare are they? And does anyone know about the genes in producing them ? I'm not even looking to breed, mice stink...

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No clue on your question but they really stink.. Sat can't come soon enough so I can get rid of this feeder I have.. If she happens to refuse I will b letting the mouse go out in the 10deg tundra