Chrome or no chrome

[onqhanoverians]

It is easy to find by testing coat hairs for the Agouti gene. I use link below but was actually looking for the chestnut/red factor.

www.vgl.ucdavis.edu/services/coatcolorhorse.php

My dark, dark bay that has hard to distinquish black points came back clearly EeA? (E=Black, e=chestnut, A=Bay/Agouti) Test cannot tell if horse is AA or Aa. I was able to see that she was Bay and carried chestnut and YES I did get that chestnut though I was hoping for the true, non-fading black of her dam.

www.onqhanoverians.com/testsite/

Trying to adjust. I love a well conformed solid. I think there is nothing sexier. BUT being a breeder I think to attract the US market I must bring some white into my herd. Thus, D'Lyte. I must say she is CUTE, CUTE, CUTE! But I think she would be just as cute to me if she were a solid. She was just bred to Landkönig. He does not carry chestnut recessive so I probably will get same as dam and sire.

http://www.onqhanoverians.com/testsi...hinargentinus/

[JB]

The problem with testing Agouti anywhere but Pet DNA is that ALL brown horses or brown carriers will come back as "bay" or "bay carriers" - Aa or AA.

All those places do is look for "a". If they don't find "a", they assume "A".

Pet DNA specifically looks for "At" if they don't find "a". They are the ONLY places who can tell you if your "dark bay" is really brown.

[Seven]

Interesting stuff. So was the real JB brown or bay?

[JB]

The real JB was bay all the way, never any question about that LOL Bay with pangare.

[doublesstable]

Originally Posted by amastrike

Here are some pictures of my boy's weird acquired socks:
http://i33.tinypic.com/2njah40.jpg
http://i36.tinypic.com/2v30r35.jpg
http://i36.tinypic.com/157m5hu.jpg
http://i38.tinypic.com/5xmn0m.jpg
http://i37.tinypic.com/2mq9s9z.jpg

And here's a full body shot of him:
http://i33.tinypic.com/iwqezs.jpg

I think this is age acquired. My 11 year old is just starting the white hairs... my other horse is too - on the face as well. My vet commented "premature aging is going on" when she saw one of my horses white hairs taking over his ankles and face...

I was going to take a pix of it today but didn't have my memory card in... (I'm talking about the camera, not myself, although I do wonder).....

One with a lot of white around the ankles is a WB....

[onqhanoverians]

Originally Posted by JB

The problem with testing Agouti anywhere but Pet DNA is that ALL brown horses or brown carriers will come back as "bay" or "bay carriers" - Aa or AA.

All those places do is look for "a". If they don't find "a", they assume "A".

Pet DNA specifically looks for "At" if they don't find "a". They are the ONLY places who can tell you if your "dark bay" is really brown.

Hmmm, I had learned that A means they display the Bay characteristics (also evidident in test result) but test (last checked) cannot tell AA or Aa. Thus to get a true black it would have to be EEaa or Eeaa. An AA horse cannot produce a black because it can only pass A. I will go out and see what PET has on UC Davis.

And when does a "brown" horse not be a chestnut (no points) or liver chestnut? Because a bay is a E with A. confused

[JB]

Originally Posted by onqhanoverians

Hmmm, I had learned that A means they display the Bay characteristics (also evidident in test result)

That's because until recently there has been no test for brown, so the only testable options were a or A. And, while not as recent, it used to be that horses were called "bay" even if they were really dark seal brown, and only called brown if it was VERY obvious (usually with dark chocolate points, instead of black). But even those obviously brown horses would have tested as "bay" because they would test as E?AA or E?Aa.

but test (last checked) cannot tell AA or Aa.

any place checking Agouti can tell the zygosity

Thus to get a true black it would have to be EEaa or Eeaa.

that is correct

An AA horse cannot produce a black because it can only pass A.

yep!

I will go out and see what PET has on UC Davis.

Not UCD - Pet DNA - http://www.petdnaservicesaz.com/

And when does a "brown" horse not be a chestnut (no points) or liver chestnut? Because a bay is a E with A. confused

Brown is a black-based horse (EE or Ee) just like bay is.

But brown, denoted as At, is just another form of Agouti. Before PetDNA did all the research on brown, the test on Agouti was ONLY to look for "a". Since each gene gets denoted by "on" or "off", in a capital or lowercase letter, respectively, the "on" presentation of Agouti, which was "not a" by the test, was given A.

Now that PetDNA can test for At, they can check for "a" and "At". If they don't find either, it's assumed to be "A".

Did that make sense?

Additionally, A (bay) is dominant over At (brown).

So, a bay horse is E?A?, meaning his Agouti status can be AA, Aa, or AAt (bay, but carries brown).

A brown horse is E?At?, meaning his Agouti status can be Ata or AtAt. It cannot be AtA because that would make him bay (and a brown carrier).

What will make this even more fun is if/when the form of Agouti which makes Wild Bay, currently called A+, is discovered. That means agouti can be either a, A, At, or A+.