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Rodent litters (Weird looking kitten)

LoboGfx

Irving Cabrales
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Mm.. quick question... is this something normal? I got this kitten from one of my litters... same age (Sunday turns 4 weeks old), very healthy, same weight as the other guys... just... almost hairless =O

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just wondering, thanks =)
 
Hi there, I breed dumbos- rexes and satins and the hairless gene is related to the rex gene. It's just a mutation. It's one of those recessive genes that doesn't come out very often and can be produced on purpose by breeding rexes to rexes. The other question- is there a possibility the mother is barbering? Sometimes mine do this when stressed and it makes rexes look like hairless rats. Looks like a genetic hairless to me though.

Wikipedia has a good explanation of this. http://en.wikipedia.org/wiki/Fancy_rat

Scroll down to the Hairless Rat section.
 
It looks like a double Rex. The homozygous Rex is hairless (fuzzy like yours, or nearly completely bare, and everything in between).
Do the parents have kinky fur and curly whiskers? I can see the curly whiskers on that little guy, which is an indicator of the Rex gene.

I have Rexes and double Rexes in my colony, my husband thinks the doubles are cool, lol.
 
It looks like a double Rex. The homozygous Rex is hairless (fuzzy like yours, or nearly completely bare, and everything in between).
Do the parents have kinky fur and curly whiskers? I can see the curly whiskers on that little guy, which is an indicator of the Rex gene.

I have Rexes and double Rexes in my colony, my husband thinks the doubles are cool, lol.

Havent check the whiskers.. but daddy is a dumbo and mammy came from a dumbo x normal litter

Thanks liltanker/WingedWolf for your help =), he/she is special after all, lol .. I may keep it for future breeding =)
 
Update:

I check my colony today and non of the parents show any Rex trait =O... but the lil guy (In pics above) does have curly whisker =D and its a boy =) turned 4 wks yesterday =D... Nature is full of surprises =D

By the way.. my breeding colony consist on 3 Normal Females (Got them from Petco) and 3 other girls from a private breeder (Also normals.. but came from a Dumbo x Normal litter). Males, All White Dumbo (Also from Petco) and an all Black Normal (From the same litter and breeder as the other 3 girls)... my Dumbo may be gay >.> he did not show any interest in the girls for the past 2 months, lol .. so all the Normal Male is the daddy of all babies...

Is the Rex Gene recessive? or what are the odds of havin a rex in a litter like mine? (Normals and Dumbos)

P.S. Liltanker, mommy is not barbering, I give her lot of time alone to remove some stress .. while she is gone I put another Female with the kinds (Or at least thats what I used to do, now the kittens are 4 wks old and pretty much eating rat blocks)
 
Sorry I didn't see your reply sooner. To answer your question, the rex gene is not recessive. I believe it is dominant. However, it does have a tendency to sometimes cause their hair to thin in places, then grow back. It will look "patchy". I have not seen this very often in my rexes, but a few have shown this characteristic.
Usually if i breed a satin to a rex, I get half and half offspring and a lot of the time I will even get more rexes than satins. My guess would be that your lil boy just got lucky with the genes and I would guess they probably came from the private breeder's gene pool. (I'm only guessing because petco's are probably so inbred it would be nearly impossible for the rex gene to be present there). I love rexes though. Something about them just makes you want to rub their little heads. Mine hate when I do that lol.
 
Sorry I didn't see your reply sooner. To answer your question, the rex gene is not recessive. I believe it is dominant. However, it does have a tendency to sometimes cause their hair to thin in places, then grow back. It will look "patchy". I have not seen this very often in my rexes, but a few have shown this characteristic.
Usually if i breed a satin to a rex, I get half and half offspring and a lot of the time I will even get more rexes than satins. My guess would be that your lil boy just got lucky with the genes and I would guess they probably came from the private breeder's gene pool. (I'm only guessing because petco's are probably so inbred it would be nearly impossible for the rex gene to be present there). I love rexes though. Something about them just makes you want to rub their little heads. Mine hate when I do that lol.

If the rex gene was dominant, then wouldn't that mean one or both of the parents would be a rex? Co-dominant possibly?
 
Cute little booger!

I had this pop up in my colony last year, out of what I thought were all just normal rats. Only thing I can figure is that the gene must've come in when I added a couple dumbo males of unknown genetic background. I looked all my breeder rats over carefully and couldn't find anything that pointed to them being rexes.

http://www.faunaclassifieds.com/forums/showthread.php?t=138357

I'll attach a couple pics since the ones from that thread got lost in cyberspace at some point. I thought I had a couple of after they went completely bald, but can't find them at the moment.
 

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Rex is codominant. This is why a rex X rex breeding produces codominant hairless...its like tiger and super tiger retics.

There is also a recessive hairless gene which is much nicer looking than the rex hairless.
 
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