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quick question..

This is a discussion on quick question.. within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category
  • Definition for intrieging

 
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    12-23-2010, 12:44 AM
  #21
Yearling
I think the differnce is horses do not "breed true" when it comes to color masking genes. I still would definitely discount the double dilutes because the color is still expressed and showing, it has just been diluted twice and not actually covered to pure white/absense of color..make sense? (cremello and perlino diluting chestnet or black/bay...the color is clearly seen, just dilute)
IMO the closest thing horses have to albino would be a maximum overo horse. Even then, patchy color comes out most of the time. Seldom is the horse all white. It will never breed true however and most maximum horses either A. Die of LWS or B. Have colord ear spots or some such.

JMO of course...Im not a genetisict..Just find color intrieging.
     
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    12-23-2010, 01:02 AM
  #22
Trained
Quote:
Originally Posted by Trinity3205    
Sabino1 - Sabino1 Testing

"Another distinguishing trait amongst sabinos is their eye color. They commonly have blue eyes or partially blue and brown eyes."
Sabino does not cause blue eyes. Other white patterns do - splash and frame to be specific. However, it is very rare to find a horse that is Sab without any other white pattern.
     
    12-23-2010, 01:07 AM
  #23
Trained
Quote:
Originally Posted by Trinity3205    
I think the differnce is horses do not "breed true" when it comes to color masking genes. I still would definitely discount the double dilutes because the color is still expressed and showing, it has just been diluted twice and not actually covered to pure white/absense of color..make sense? (cremello and perlino diluting chestnet or black/bay...the color is clearly seen, just dilute)
IMO the closest thing horses have to albino would be a maximum overo horse. Even then, patchy color comes out most of the time. Seldom is the horse all white. It will never breed true however and most maximum horses either A. Die of LWS or B. Have colord ear spots or some such.

JMO of course...Im not a genetisict..Just find color intrieging.
Quote:
al·bi·no (l-bn)
N. Pl. Al·bi·nos
1. A person or animal lacking normal pigmentation, with the result being that the skin and hair are abnormally white or milky and the eyes have a pink or blue iris and a deep-red pupil.
from albino - definition of albino by the Free Online Dictionary, Thesaurus and Encyclopedia.

We have an image in our mind that albino = white with pink eyes. However, it may not display the same in every species, but it is albino.
     
    12-23-2010, 01:25 AM
  #24
Yearling
I think that is simplistic and ther emay be more to the blue eyes of sabinos than we know. Sabino is a complex color pattern and works with other genes to produce its patterns. I think it is very likely that sabino and its cohorts lol can produce blue eyes or parti speckled eyes all by itself. The truth is we don't know for certain yet....to be fair.

The pattern of sabino horses is polygenic - that is, controlled by more than one gene. http://www.horse-genetics.com/sabino...-genetics.html

"Blue eyes may sometimes occur in sabino horses, but are not considered to be characteristic of the type. Certain lines of horses exhibit blue eyes, such as the Khemosabi line in Arabians, though often only one blue eye is present. Probably blue eyes is linked to sabino in these lines, being caused by a separate gene that is often inherited with the sabino gene. "

http://www.horse-genetics.com/sabino-horses.html



More about cream and albino in horses.

Cream horses are sometimes called pseudo-albinos. In other animals (including humans) there are recessive alleles at the C locus that cause true albinism. Individuals homozygous for these alleles lack pigment in the hair, skin and eyes. Their eyes and skin are pink (due to the effect of the blood vessels beneath the surface) and albinism is often accompanied by various congenital defects. No true albino horses have ever been observed and presumably they are inviable (i.e. Die in utero). The author also notes, from experience, that people often refer to cream horses as being white, although this is not the case.

cream horses
     
    12-23-2010, 02:16 AM
  #25
Trained
What I am saying is show me a Sab with blue eyes that DEFINITELY does not carry splash or frame. Since splash doesn't have a test yet(?) it is impossible to isolate and be sure that it is Sab causing the blue eyes.
     
    12-23-2010, 04:34 AM
  #26
Yearling
SB1 does NOT cause blue eyes. Blue-eyed Arabians are most likely carrying Splash. Also, much of what is considered to be "Sabino" in the Arab world is actually Dominant White (which also does not cause blue eyes).
     
    12-23-2010, 07:21 PM
  #27
Started
Quote:
Originally Posted by Chiilaa    
Sabino does not cause blue eyes.
That's good to know because I love sabino but I hate blue eyes!

But going back to the albino question... Albinism is actually a metabolic disorder in which the body doesn't produce pigment. Keep in mind skin is replaced all the time, so pigment production is an ongoing process. You're not just born with it and that's that. Double dilutes OTOH do produce pigment - it just happens to be light in color.
     
    12-24-2010, 01:04 AM
  #28
Weanling
Just curious, Are there albino humans? I heard there were, but wasn't entirely sure that's true.
     
    12-24-2010, 06:14 AM
  #29
Trained
Yup - 1 in 20 000 chance :)
     
    12-24-2010, 06:19 AM
  #30
Trained
Quote:
Originally Posted by Trinity3205    


http://www.horse-genetics.com/sabino-horses.html



More about cream and albino in horses.

Cream horses are sometimes called pseudo-albinos. In other animals (including humans) there are recessive alleles at the C locus that cause true albinism. Individuals homozygous for these alleles lack pigment in the hair, skin and eyes. Their eyes and skin are pink (due to the effect of the blood vessels beneath the surface) and albinism is often accompanied by various congenital defects. No true albino horses have ever been observed and presumably they are inviable (i.e. Die in utero). The author also notes, from experience, that people often refer to cream horses as being white, although this is not the case.

cream horses
Even in albino humans dark hair retains some colour. The skin of a cremello/perlino is pink, and their eyes are blue. They are meeting the requirements of being classed as albino.
     

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