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Discussion on Double Homozygous Stallion question
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New Member:
Gintx
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Posted on Wednesday, Dec 29, 2004 - 3:38 pm:
I stand a grey tobiano stallion. He is homozygous for black and homozygous for tobiano. He was registered as a black and while trying to change him to grey, APHA said "nope, he's a blue roan." Well... after much aggrivation, we finally have him registered as a grey 
I have several people asking me about breeding their dun and bay mares to him to get a buckskin.
His name is Oreos Blk Litning www.boykinfarm.com
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Member:
Heidih
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Posted on Thursday, Dec 30, 2004 - 12:33 pm:
I just looked at your boy, very cute. He looks like he was a true black that's turning gray. If that's what he is, there's no way he'd produce a buckskin out of a bay mare. A dun mare would have a chance of producing dun or grulla (with at least a 50% chance of gray), but no true buckskins. Now if they bred to your palomino boy, they'd have a 50% chance at most of the dilute colors.
Good luck breeding.
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Member:
Mrose
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Posted on Thursday, Dec 30, 2004 - 1:45 pm:
What lovely horses! (and this from an Arab breeder ) You've a well done web site ,too.
Was the stolen horse ever found?
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Member:
Gintx
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Posted on Thursday, Dec 30, 2004 - 4:21 pm:
Saddly, Carolina has not been found. Her owner is just sick. She's has spent thousands of dollars in searching for this mare. It's just heartbreaking.
Thanks for the info on the bays and duns! Helps a lot.
Also, thanks for the compliments on my horses and website!!
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Moderator:
DrO
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Posted on Saturday, Jan 1, 2005 - 9:49 am:
Ginger if you would like to learn more about color genetics see Horse Management Courses members_only » Anatomy » Coat Color & Genetics.
DrO
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Member:
Gintx
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Posted on Saturday, Jan 8, 2005 - 10:31 pm:
Ok, I'm going to take a class on genetics. I'm still very fuzzy though. I understand my gray stallion's genetics better and thanks all who helped and for the great link. I'm now wanting to breed my buckskin mare to a buckskin stallion. His sire is a buckskin and HIS sire and dam are palomino and bay. The stallions dam is a chestnut and HER sire and dam are both sorrels with sorrel, chestnut palomino and bay parentage.
My mare's sire is a palomino and his sire and dam are buckskin and red dun. Her dam is brown and her parents are a brown and a sorrel. I'm really trying to get a buckskin foal for a client. The color of my foals have never been important to me but my client has been wanting a buckskin out of my buckskin mare for about 3 years. So... without being too much of a pest, do you think this would be a good percentage of being buckskin? I'm headed back over to read more on Coat Color & Genetics. Thanks!!
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Moderator:
DrO
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Posted on Sunday, Jan 9, 2005 - 10:49 am:
Ginger I am uncertain as to the gentics of your "brown" mares dam (and granddam) making a calculation difficult. Can you better define the color or care to speculate on the genetics of the dam.
DrO
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Member:
Gintx
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Posted on Sunday, Jan 9, 2005 - 11:42 am:
Hello, I may have worded it wrong. Sorry, I was at work and rushed.
My mare is buckskin. Her sire is palomino, her dam is registered as brown. My mares dam's dam is brown. My mares dam's sire is sorrel. LOL, her registration number is 592,918 from APHA.
The stallion is AQHA 3402871. Don't know why I didn't just post that earlier.
Thanks for all your help. My class isn't until the spring but I'm really looking forward to it. Thanks again for your help.
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Member:
Heidih
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Posted on Monday, Jan 10, 2005 - 10:06 am:
Hello Ginger,
Chances are that the "brown" mare was really a bay. I know that the stock horse breeds and Jockey Club will register dark bay horses as "Brown or Dark Bay", with AQHA usually leaving off the Dark Bay portion.
Just a note that genetically speaking Chestnut and Sorrel are both the same. Red horses without the black gene present.
I did some basic calculations based on the the assumption that your mare's dam is a bay. What I come up with (and someone else correct me if I'm wront) is the following:
Perlino (double dilute with black gene) - 18.75%
Cremello (double dilute/ no black gene) - 6.25%
Buckskin - 37.5%
Palomino - 12.5%
Bay - 18.75%
Sorrel/Chestnut - 6.25%
This is assuming that there isn't a dun gene hiding under the buckskin of the mare, since she does have a dun grandparent. It's not real likely, but would add that dilution to the mix and change the numbers 1/2 to give the dun variation of each color. Also I'm assuming (I know I shouldn't assume) that both horses are homozygous for agouti, the gene that limits the black to the points. If they aren't, then that would add the chance of black and smokey black to the black based colors. Since there doesn't appear to be any blacks in the recent pedigree, I didn't figure that in.
I hope this is correct. Any other experts please feel free to correct me if I've missed something.
Good luck.
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