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Roan Gene ?

Equine-Reproduction.com Bulletin Board » Equine Genetics » Roan Gene ? « Previous Next »


Author Message
 

tara
Neonate
Username: Tarafawn

Post Number: 10
Registered: 04-2009
Posted on Saturday, May 02, 2009 - 12:42 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have heard Roan is a dominate color. I have a APHA Red Roan overo mare . WE had her bred in 2006 to a sorrel overo with flaxen mane and tail. She produced a Red Roan loud overo filly with flaxen mane and tail. We are trying to get her in foal to a dark bay overo I have also heard bays are dominate.. SO was wondering what the color possibilities were for the resulting foal? I will try to post some pictures of her and her 2007 filly.
 

Kathee McGuire
Senior Stallion or Mare
Username: Katheekj

Post Number: 1252
Registered: 12-2005
Posted on Saturday, May 02, 2009 - 11:17 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If roan is passed, it is expressed. A bay is only dominate if it is homozygous for both black and agouti. Most bays are not homozygous for both genes so they can thow other colors/patterns. With a bay (black based horse) bred to a red based horse, your chances depend on if the bay is homozygous for the black or if he carries the black and red gene. Your mare has 2 copies of the red gene and black will always dominate over red. The gene he passes will control the base color of your foal. If he has 2 black genes (homozygous) you will have a black based foal because he can only pass black and your mare can only pass red, so his black will dominate. If he is heterozygous (has black and red) and throws red - your mare can only throw red so you will have a red based foal - heterozygous that throws black will produce a black based foal.

His agouti will only be a factor if the foal has a black base - it will not have any physical effect on a red based horse. In fact, your mare could carry an agouti gene that is not expressed - just depends on her breeding.
 

Diana Gilger
Senior Stallion or Mare
Username: Kdgilger

Post Number: 2233
Registered: 01-2008
Posted on Saturday, May 02, 2009 - 12:24 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hey Kathee, you're so good at this stuff!! Mind trying a color for me??? not to hijack the thread or anything...I have posted on the Onyx Foal Watch Thread new pics of my foal...I thought he was black, but he's lightened in the days since birth and turns out to have sky blue eyes. Of course he's appy....and appies rarely come with blue eyes if they dont' have white on them ..he has none. I wonder what are the chances of him roaning like mom?
 

Terry Waechter P.R.E. foals
Breeding Stock
Username: Watchman

Post Number: 678
Registered: 01-2007
Posted on Saturday, May 02, 2009 - 01:57 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Kathee is an expert as it looks like she has done all her homework...as for your own horses the only way to be sure about color and what combinations are possible is to color test with Davis or Animal Genetics and then study color genetics to understand the test results, It is a really fun thing to do and it is easy to get "hooked" on figuring out the possibilities...
 

Kathee McGuire
Senior Stallion or Mare
Username: Katheekj

Post Number: 1254
Registered: 12-2005
Posted on Saturday, May 02, 2009 - 07:25 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank for the vote of confidence Terry, but I am definately not an expert! The parts I know, I know pretty well, but there is so much I don't know. Apps are one of the areas I don't have much background and the research there is still forth coming.

I started with my horses and learned their genetic make up and then studied other horses I knew such as the stallions I chose for breeding.

You are right about using tests to be sure if you don't have obvious answer through existing foals. Dream is black based and has had 2 black based babies, but she carries the red gene. It would be easy to guess she only carried black, but it would be totally wrong. But, if she popped out a chestnut or palomino in addition to a black, I would have known she carried both genes. Most of us don't have that kind of history and the tests are inexpensive so I always recommend testing if there is any question.

Diane - I will do some studing on your foal and let you know what I find out. My stallion owner friend just acquired 2 leopard app mares for breeding to her Friesian and she has already asked me to brush up in that area.
 

tara
Nursing Foal
Username: Tarafawn

Post Number: 18
Registered: 04-2009
Posted on Saturday, May 09, 2009 - 04:53 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

[IMG]http://i134.photobucket.com/albums/q115/lycan84/rosieshylohsleepin2.jpg[/IMG]


Here is my roan overo mare and her filly right after she had her..
 

tara
Nursing Foal
Username: Tarafawn

Post Number: 19
Registered: 04-2009
Posted on Saturday, May 09, 2009 - 05:30 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

They are in no particular order but some birth to yearling year pictures of my filly and her dam. You can see how the filly changed from chestnut looking to roan. I had to submit so many photos to APHA to prove she was roan! Her undercoat had so many white hairs so I knew she would be roan.. you can see what she looked like as a yearling:-)

[IMG]http://i134.photobucket.com/albums/q115/lycan84/rosieshyloh.jpg[/IMG] (hours old)

[IMG]http://i134.photobucket.com/albums/q115/lycan84/095.jpg[/IMG] (Rosies 2007 filly)

[IMG]http://i134.photobucket.com/albums/q115/lycan84/tnshyloh2.jpg[/IMG]

[IMG]http://i134.photobucket.com/albums/q115/lycan84/rosiehead.jpg[/IMG]


[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_0d36405f3969429f9220cfc5f5f831 1c.jpg[/IMG]


[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_c3698dba482e471a8f3a093fd93708 fc.jpg[/IMG]

[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_4fbdcb88c93b48d4aa9406eece8d60 b6.jpg[/IMG]

[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_4392a27b534145aeaaaf457587b054 f3.jpg[/IMG]

[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_91cf1fdb8a1e40d0bc3960a11353ae 85.jpg[/IMG]

[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_f7b07706b49b4db89a033fcac57a88 e5.jpg[/IMG]

[IMG]http://i134.photobucket.com/albums/q115/lycan84/l_eab8d48bb0473e1f845974de5a5d48 6f.jpg[/IMG]
 

Emily West, Zita born 4/12
Breeding Stock
Username: Paintlover

Post Number: 844
Registered: 06-2006
Posted on Saturday, May 09, 2009 - 06:50 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Nice mare and Foal!!!!!
 

Kathee McGuire
Senior Stallion or Mare
Username: Katheekj

Post Number: 1340
Registered: 12-2005
Posted on Saturday, May 09, 2009 - 09:08 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Wow - what an awesome color and pattern! Both mares are exceptional!



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