I just started throwing Black Eyed Whites myself. Most of the pairings offspring are very lightly marked Masked, with 25% being true Black Eyed Whites. So far, the offspring aren't showing issues with megacolon and some of them are upwards of six months old.
The same pairing throws really odd blue colors with the masked offspring. Which I remember there being Blue color caused by the spotting gene (High White), but wasn't really explored due to it being dangerous. I think it was called Chinchilla or some such.
Anyway, very adorable babies! I really enjoy seeing all of the ratties you have. If you didn't live so far away, I'd be bumming a Burmese out of you.
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