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by ggturner on 30 July 2013 - 19:07
CALICO DOG MAY BE A CHIMERA
THE DAILY DISHMore on PawNation: Awesome, Chimeras, Dogs, WeirdBy Paul Ciampanelli Jul 24th 2013
A photograph of a dog at a veterinary hospital has gone viral this week because of the animal's unusual but beautiful markings. The Labrador Retriever, Bull, has a coat colored like that of a calico cat. He is a patient at Texas A&M Veterinary Medical Teaching Hospital, according to MSN Now.
Because of Bull's unique coat, he is suspected of being a chimera, a single animal that genetically is two animals, i.e., an individual that is its own twin. Bull, then, appears to be a chimera that is both black Lab and yellow Lab.
We saw this phenomenon last summer when a "two-faced" calico chimera cat named Venus caught the Internet's attention. Bull has emerged as Venus' canine counterpart, albeit without the same dead-even color split down the middle of his face.
Whether Bull is a chimera hasn't been confirmed medically yet, but we'll watch the veterinary hospital's Facebook page to see if they post any further information and, hopefully, more photos of this interesting dog.
SEE PHOTOS OF VENUS THE CHIMERA CAT:
by GSD Lineage on 30 July 2013 - 19:07
Similar dogs on this blog, but they claim they are mosaics.
I am bit upset they don't tell us if it is a chimera, as that should be easy for them, being Texas A&M.
http://retrieverman.net/2012/06/25/labrador-pictus/
by hexe on 30 July 2013 - 19:07
by GSD Lineage on 30 July 2013 - 20:07
by troopscott on 30 July 2013 - 20:07
by EuroShepherd on 31 July 2013 - 00:07
The genetic reasons for mosaic in labradors is different than the genetic reason for calicos in cats which is different than the genetic reason for harlequins and tri-colors in rabbits which is different than the genetic reasons for wild african cape dog coat pattern, so on and so forth.
The mosaic pattern in labradors has a pretty unusual reason for the way it happens, it's not inherited in the traditional sense of color/genetic inheritance. The mosaics are fairly rare, should someone breed a mosaic labrador thinking they'll get more of the same will be sorely disappointed, the chances of a mosaic labrador producing more mosaics (even in 2nd or 3rd generation) is as unlikely as a solid color labrador producing a mosaic in the first place.
Clearly there is some kind of genetic connection, as this phenomenon is mostly only known of in goldens and labradors... but it's not well understood.
I knew of one pretty yellow labrador female who was an AKC champion (conformation) who had a mismark black spot on her side, it was easy to miss, maybe about the size of a nickle, it was believed that spot was caused by the mosaic phenomenon. She never produced any pups with mismark spots like that (and I would know, since I was present for the whelping of her litters...we looked her pups over very carefully.)
by Hundmutter on 31 July 2013 - 04:07
this as a new color to sell won't have any luck !
The Comments on Lineage's link made very interesting reading:
one poster talked about the structure of another ('mosaic') e.g.
with photos on there, not being a 'good' Lab, & that being more
important than its colour - and got howled down by all those
saying 'genetically interesting' is more relevant than conformation
& Standards, 'well-made' dogs did not always work as well as
those which 'should' be too badly angled to move properly ...
the usual back & forth. But everyone ignored her point that there
might be people who would risk mass inbreeding to produce quantities
of a colour which would be very popular, as 'novel'.
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