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Satin meeces were bred from animals that were subjected to radiation back in the 50's; I'm not sure who bred the satins to the state of being a stable tranmissable phenotype (phenotype=visible traits). Satin meeces are based on a recessive gene, meaning that both dam and sire must carry the trait. Since both your new beauties are satin, you will get al satin, and all long haired as well, since long hair is also recessive.

The blue doe is very, very nice looking. I'm envious as all get out. At the same time, I hope you got healthy individuals who aren't inbred. Satin meeces can suffer from a number of health problems including low fertility, problems with digesting food, and if the babies inherit too many harmful recessives, they can be very compromised health wise. I'd suggest crossing to a standard coat short hair first. Maybe you'll get lucky on this mating. I'll keep my fingers crossed for you and your mousies.

BTW, the reason the fur looks shiny is that the individual hairs are hollow, a trait satin meeces share with polar bears.
 

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You never know with pet store meeces. The girl you show looks like to be a lot younger than the himi boy, so she may gain size given a little time. Do you know how old the girls are? They shouldn't be bred until they are at least 12 weeks old.
 

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The buck could be their sire, for all one can tell. Line breeding is one way to breed if you've got characteristics you want to strengthen. You'd end up with all satin long haired babies with the two you've shown. Putting two meeces together and getting a litter will also give you more information about what else they carry. Eight weeks is a little too young, although they would also be growing while carrying the litters. If they are pregnant, or may be prgnant, be sure to give them extra nourishment so they have adequate protein , etc. to support their own growth and that of any possible babies.
 

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If the girls were in with males at the place you got them, they could already be pregnant. Nothing you can do about it except for maybe a little extra nutritional support.
 
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