Breeding a homozygous black/white to a homozygous red/dun? - The Horse Forum
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post #1 of 27 Old 03-02-2011, 10:53 AM Thread Starter
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Breeding a homozygous black/white to a homozygous red/dun?

I have an APHA mare that is tested homozygous for both her color (black and white) and her pattern (tobiano). If she was bred with a homozygous dun or red stallion, how exactly would that play out for the color/pattern of the foal? I am not too familiar with genetics and have been fairly curious. I am not breeding her as obviously I am not experienced, but I would love any information that you might be able to provide :) Thanks and God Bless.
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post #2 of 27 Old 03-02-2011, 11:21 AM
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On the stallion do you mean just red (chestnut) with dun, or dun (bay with dun)? And homozygous for the dun gene?
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post #3 of 27 Old 03-02-2011, 11:21 AM
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Coat Color Calculator



Shown below are the possible offspring coat colors and the probability of each determined using the given information of the sire and dam. Accuracy of the calculations are increase when more genetic information is known of the parents.

Sire Color: Red Dun Tobiano
Agouti:
aa, Aa, AA
Tobiano:
TT
Red Factor:
ee
LWO:
nn
Cream:
nn
Sabino:
nn
Silver:
nn
Splash:
nn
Dun:
Dd
Roan:
rr
Champagne:
nn
Gray:
gg
Dam Color: Black Tobiano
Agouti:
aa
Tobiano:
TT
Red Factor:
Ee, EE
LWO:
nn
Cream:
nn
Sabino:
nn
Silver:
nn
Splash:
nn
Dun:
dd
Roan:
rr
Champagne:
nn
Gray:
gg

Details: Grullo Tobiano
Ee/aa/Dd/TT = 16.6675%


Details: Black Tobiano
Ee/aa/TT = 16.6675%


Details: Bay Tobiano
Ee/Aa/TT = 16.6675%


Details: Bay Dun Tobiano
Ee/Aa/Dd/TT = 16.6675%


Details: Red Dun Tobiano
ee/Aa/Dd/TT = 8.3325%
ee/aa/Dd/TT = 8.3325%


Details: Chestnut Tobiano
ee/Aa/TT = 8.3325%
ee/aa/TT = 8.3325%

Details: All

Ee/Aa/Dd/TT = 16.6675%
Ee/Aa/TT = 16.6675%
Ee/aa/Dd/TT = 16.6675%
Ee/aa/TT = 16.6675%
ee/Aa/Dd/TT = 8.3325%
ee/Aa/TT = 8.3325%
ee/aa/Dd/TT = 8.3325%
ee/aa/TT = 8.3325%

Offspring Color Probability

16.67% -
Grullo Tobiano
16.67% -
Black Tobiano
16.67% -
Bay Tobiano
16.67% -
Bay Dun Tobiano
16.67% -
Red Dun Tobiano
16.67% -
Chestnut Tobiano


















Time = 0.109375 sec


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post #4 of 27 Old 03-02-2011, 11:24 AM
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Offspring Color Probability

8.33% -
Grullo Tobiano
8.33% -
Grullo
8.33% -
Black Tobiano
8.33% -
Black
8.33% -
Bay Tobiano
8.33% -
Bay Dun Tobiano
8.33% -
Bay Dun
8.33% -
Bay
8.33% -
Red Dun Tobiano
8.33% -
Red Dun
8.33% -
Chestnut Tobiano
8.33% -
Chestnut

This was for a red dun stallion and black tobiano mare... the other was tobiano for both parents....

"Equine-facilitated therapy employs a form of biofeedback for practicing self-awareness, emotional management, and relationship skills that human role-playing exercises and discussion groups cannot begin to access." Linda Kohanov (The Tao of Equus)
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post #5 of 27 Old 03-02-2011, 01:12 PM
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Is there such a thing as homozygous dun? I'm so not experienced with color stuff either!
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post #6 of 27 Old 03-02-2011, 01:13 PM
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Yes there is. It just means that horse is carrying two copies of the dun gene instead of one.
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post #7 of 27 Old 03-02-2011, 01:17 PM
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^How is it expressed? Or do you just have to test for it?

So the OP's mare (homozygous for tobiano and black) bred to a stud that's homozgyous for dun you'd have to get a grullo tobiano right? Grullo is dun expressed on black, right? Thanks!!

Sorry for hyjacking the thread!!
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post #8 of 27 Old 03-02-2011, 01:19 PM Thread Starter
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Bahaha thank you guys...I didn't realize that there were so many possibilities! If I do end up breeding her in the future, I have a gorgeous bay stud in mind...I would like to believe that her baby would looks as much like her as possible :) Thanks so much for all of the help!
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post #9 of 27 Old 03-02-2011, 01:24 PM
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Your mare is gorgeous!! I love the speckles on her back.

My black and white tobi is roany on his sides so he looks all smudged. Not that you could really tell with all the mud ... :(
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post #10 of 27 Old 03-02-2011, 01:25 PM
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Sundee - A homozygous dun will express exactly the same as a heterozygous dun. The only way to know for sure is to test.
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