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Post by lucydales on May 6, 2009 8:07:04 GMT -1
Can you pls explain roan colouring genetics for me (or point me to a previous thread, I've looked but can't find one, and the link in Vanda's thread wasn't great on roans!) If I breed a black Dales mare to a blue roan Dales stallion (no prizes for guessing who! LOL!) what are my chances of getting a black vs a roan baby?? I assume I can't get a bay/bay roan baby as they must both be EE and aa to be black/blue roan, or does it need an A to give the bay type black points in the roan?? Can you see why I'm having problems!  Don't worry if you've not got time Heather, but many thanks if you have!  |
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Post by lucydales on May 6, 2009 20:12:57 GMT -1
Heather, thank you so much!! Stallion in question is Rr as has bred both black/bay and roan foals. I think you are (slowly) getting me there with genetics and am becoming geeky too! I was explaining to someone at the Spring Show that black was recessive (they had said it was dominant)!! So my reality is Amy or Celt stand a 50:50 chance of a blue roan foal to a heterozygous blue roan stallion. I am not struck on roans (though Sue is!) and the chap has Alick and ABP in his pedigree (common as muck!) but also some interesting mare lines so may progress this unless he looses his wedding tackle (like Ebony Stan who was on my hit list) before I get a chance! I do think genetics are facinating!  |
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Post by Anna on May 6, 2009 20:27:45 GMT -1
ahhh I'm dead proud of myself, i nearly answered this thread earlier saying 50:50% chance but backed out because i wasn't sure! I must be finally understanding!! |
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Post by lucydales on May 6, 2009 21:41:08 GMT -1
RR would give you 100%, Rr 50%, Heather has busted the myth of not breeding two roans together (lethal gene). That may be cos of Fell roans getting mixed up with FIDS??
Well done Anna! So is Rock a bay roan??
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Post by lucydales on May 7, 2009 19:57:36 GMT -1
I typed a long reply Heather and the internet went down and ate it!  I agree with you and Evie that no good pony is a bad colour! Thanks for your brill response, I will try again tomorrow! |
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Post by Debbie on May 9, 2009 21:23:51 GMT -1
I thought it would be 50/50 for black or blue roan as well, but Heather goes into such fantastic detail about why. I always love to see her genetic writeups, even if it makes my head implode at times ;D Go on, Lu, you know you want to  Besides, I'm dying to see a roan foalie on here  |
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Post by dalesponyrider on May 10, 2009 5:27:29 GMT -1
I just can't follow it! I wish I could as I would really like to understand D's genetics. I have a problem following this sort of thing since my head injury. I have can't play chess any more either as I can't hold two bits of information at the same time! I will have to sit down with pen and paper and make a diagram myself to see if I can understand it.
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Post by Debbie on May 10, 2009 12:20:06 GMT -1
If the baby comes through as a chestnut with white, D can claim it as a changeling ;D You're welcome for the testing Heather When I get the chance, we'll go through and test for grey. I still can't decide if Blossom's going to shock me and turn grey after being a seal bay all these years.  I'll love her dearly no matter what colour she goes, but its been fun having the DNA test done.  Love your new avatar Heather.
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Post by jap on May 10, 2009 13:06:02 GMT -1
if "D"s foal comes out chesnut with white i'll...................
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Post by lucydales on May 11, 2009 10:40:29 GMT -1
if "D"s foal comes out chesnut with white i'll................... ...then we'll know it was a "grudge baby" (someone had it in for Big Mag!!!!!) |
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Post by lucydales on May 11, 2009 10:41:30 GMT -1
Do white markings trump no white markings then Heather or do you need two Sb1 genes??
Can white markings be hidden in generations or does one parent have to have some white to get white?
Your ladder analogy was great thanks!
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Post by dalesponyrider on May 11, 2009 15:23:29 GMT -1
D has a tiny bit of white on her forehead! Also a smattering of grey hairs all over. Unless I pull them out of course! There are so few that I can actually do that!
Thanks for the explanation Heather! I will print it off and peruse it at leisure when I am actually installed in the caravan!
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Post by jap on May 12, 2009 8:32:33 GMT -1
magic,to date with one mare left to foal this year, still has a true 100% record of breeding only section A foals.Interestingly he has only thrown 3 colts,2 out of the same mare and the other was out of that mares aunt. Most of our thouroughbreds are born with a very large star and 2 white hinds regardless of the stallions markings,this marking comes through the dams side.she had 2 colts to zaha and now has all fillies to a variety of sires,all bar one are chesnut except for the mark of esteem filly who is bay like he is but has the mares white markings.
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Post by dalesponyrider on May 12, 2009 18:05:13 GMT -1
So if the foal is a dark bay, what colour will it be at birth? What colour will it be at birth if it's black?
I need to know if it's going to be bay or black before I name it if it's a filly! ;D
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Post by lucydales on May 17, 2009 19:39:57 GMT -1
Can someone answer Linda's question pleeeease?? I don't know what bay babies are born as. I think (bay) Amber was orange?!! Grey's are black, and blacks are various! Tim was moleskin coloured. Help!
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I'll love her dearly no matter what colour she goes, but its been fun having the DNA test done. 
Love your new avatar Heather.