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I believe silvermane is dominant, at least that’s what this link (https://www.onceuponamischief.com/variety-silvermane) says, but it is unknown.

I believe the breeder said 2 were likely silvermane, so if it’s recessive then I know those are carriers. If they show up in all litters, then I believe it’s safe to assume it is dominant? I’m fairly sure the rex/hairless girl (whichever she happens to be) has no chance of being silvermane.

Do you know much about the hairless and rex varieties? I was initially told by someone that hairless were selectively bred rexes, but some reading and videos seem to imply they’re separate genes? I’m just wondering what sort of results I’d get breeding my rex girl to a hairless male (I haven’t seen him yet and won’t get him until the new rack is built).


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Well, don't quote me on silvermane, lol. I definitely don't know. Might be mixing it up with roan which I also don't have, haha.

I have rex and I can 100% confirm that the "hairless is a selective bred rex" is complete garbage. They're entirely separate genes. Rex is a dominant with a visual homozygous form called drex or double rex, it varies in appearance a bit but can appear similar to hairless. Hairless is a recessive gene where homozygous form is reliably lacking most if not all hair.
I don't have hairless, but I think there is a way to tell via whiskers. I'm not too sure though. I have only hit 1 I think is drex and she's still pretty young.

Rex to hairless will give you 50% rex rats, 50% standard, 100% carriers for hairless. Breeding a rex carrier back to the hairless would give you on average 25% rex (carriers for hairless), 25% rex + hairless, 25% hairless, and 25% standard that are carriers for hairless.

It gets messy and hard to differentiate the genes further on (i.e. rex hairless vs just hairless, or drex hairless even), so I'd personally avoid making that pairing unless you have no choice or don't actually care what the turnout is (i.e. 100% feeders for the babies). It could be very difficult down the line to determine which babies have what if you did try to sell/advertise pets or to other breeders searching for specific genetics. (Someone who knows more obvious identifiers for hairless vs rex may not have that issue, but that's a trick I don't have lol)

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