Are these bay horses or are they actually brown? - Page 3
 
 

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Are these bay horses or are they actually brown?

This is a discussion on Are these bay horses or are they actually brown? within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category
  • Difference between brown and bay horse
  • Two bay horses

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    04-19-2012, 04:01 AM
  #21
Trained
I want to say brown looking at her. The way the darker colour tends to run up her neck makes me think it's not sooty, but brown. However, none of the shots are great for telling really - summer is when browns look most like bay lol. What does she look like in winter?
     
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    04-19-2012, 11:23 AM
  #22
Weanling
Quote:
Originally Posted by Chiilaa    
I want to say brown looking at her. The way the darker colour tends to run up her neck makes me think it's not sooty, but brown. However, none of the shots are great for telling really - summer is when browns look most like bay lol. What does she look like in winter?
Dunno, lol. Haven't had her for long enough. It's getting towards winter in Chile now, I'll try and get a photo. There's something else - can pregnancy hormones change a horse's colour too?
     
    05-09-2012, 05:59 AM
  #23
Weanling
Here are some winter photos. So, bay or brown?

Nice brown muzzle:


Sunlight coming from behind her so a bit distracting:


Busy eating for two:


The last photo does show some lightening around the flank but she's not radically different from her summer look. So, what do you all think?
     
    05-09-2012, 06:19 AM
  #24
Trained
Brown, definitely
     
    05-09-2012, 06:43 AM
  #25
Weanling
Thanks! We love her whatever colour she is - and now we get to wait to see what colour her foal is, and therefore guess at who the stud might have been...
     
    05-09-2012, 05:48 PM
  #26
Yearling
I would call that last one a bay. In the rest of the pics I see maybe three browns.
     
    05-10-2012, 06:53 AM
  #27
Green Broke
Registries are notoriously behind science for colors. AFAIK, the difference between the "bay" (A) and "brown" (At) agouti genes is a relatively recent discovery.

It also makes a difference if the horse has one or two copies of At, with the horse being darker with only one (At/a) vs. two (At/At). At is also recessive to A, so a horse that is (At/A) will be bay, not brown.
     
    05-10-2012, 10:09 AM
  #28
Started
Quote:
Originally Posted by verona1016    
Registries are notoriously behind science for colors. AFAIK, the difference between the "bay" (A) and "brown" (At) agouti genes is a relatively recent discovery.

It also makes a difference if the horse has one or two copies of At, with the horse being darker with only one (At/a) vs. two (At/At). At is also recessive to A, so a horse that is (At/A) will be bay, not brown.
That is interesting, but I know that the first three I posted can only have one agouti since the sires were solid blacks. So Princess's very dark daughter was by a homozygous solid black. Unless a horse can pass on more than one agouti (coming from Princess who would have had to received two agouti from her chestnut dam), Katie only has one agouti and is very dark in color. Princess, Katie and Diga can only have received agouti from their dam because solid black stallions cannot be agouti carriers ;)
     
    05-10-2012, 10:13 AM
  #29
Green Broke
Quote:
Originally Posted by SunnyDraco    
That is interesting, but I know that the first three I posted can only have one agouti since the sires were solid blacks. So Princess's very dark daughter was by a homozygous solid black. Unless a horse can pass on more than one agouti (coming from Princess who would have had to received two agouti from her chestnut dam), Katie only has one agouti and is very dark in color. Princess, Katie and Diga can only have received agouti from their dam because solid black stallions cannot be agouti carriers ;)
That's correct. Agouti limits the expression of black, so with only one Agouti (at least with brown/At), they would be darker than with two. I'm not sure if they same effect holds true for the bay agouti.
     
    05-10-2012, 10:14 AM
  #30
Trained
The correlation between AtAt being lighter and Ata being darker was a trend, not a rule SunnyDraco
     

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bay, brown, color, identification, question

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