I am breeding my red dun mare to a blue roan stallion. What colours can I get?

Answers:
if you cross a red dun with a blue roan you could get a few thigs, thats going to depend on your mares agouti status and the studs creme status. red horses carry agouti without showing it and black horses carry creme with out showing it. if your mare dosent have agouti and the stud dosent have the creme gene you could get
red dun
grulla
black
sorrel/chestnut
red roan
blue roan
grulla roan
red dun roan
assuming of course that the stallion carries the red gene if not the only colors you could get are
grulla
grulla roan
black
blue roan
if your mare carries the agouti gene and the stud does not have the creme gene you could get
red dun
red dun roan
chestnut
red roan
dun
dun roan
grulla
grulla roan
black
blue roan
bay
bay roan
again assuming stud carries the red gene if not then you get
dun
dun roan
black
blue roan
bay
bay roan
grulla
grulla roan
now if the stud carries both the red and creme gene and your mare carries agouti you could get
palomino
blue roan
chestnut/sorrel
red roan
dunalino
dunalino roan
black
grulla roan
smokey grulla roan (carries creme gene)
palomino roan
red dun
red dun roan
smokey black
smokey blue roan
smokey grulla
grulla
bay
bay roan
buckskin
buckskin roan
dunskin
dunskin roan
dun
dun roan
basically any color you could think of except perlino, cremello and champagne. now if your mare does not have agouti eliminate all the bay based colors from the previous list. if the stud lacks the creme gene eliminate all the creme based colors. if the stud lacks red eliminate all the red based colors. easy way to tell if your mare has agouti is dna testing, but lacking that if she has ever foaled a bay or bay based color when bred to a black horse, she has the agouti gene. the studs creme status is easy too, has he ever sired a dilute color from another solid mare, if he has . then he has the creme gene. same with red, if he ever sired a chestnut/sorrel from another black based horse he is a red carrier. if you know the genetic standing of the two horses you can use this site to guess colors and the percent chance it will occur
http://www.horsetesting.com/ccalculator1...
either way your mare will pass the dun gene 50% of the time, the stud will pass the roan 50% of the time which means you have a 25% chance of getting a dun only, 25% of a roan only, 25% chance of a combination of both dun and roan and a 25% of getting none of them. so 75% of the time this combiantion will result in a color foal and only 25% getting a solid.

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According to the Primary Color wheel you may get purple/violet
http://faculty.indy.cc.ks.us/jnull/color...

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12.50% - Zebra Dun Roan
12.50% - Zebra Dun
12.50% - Grullo Roan
12.50% - Grullo
12.50% - Red Dun Roan
12.50% - Red Dun
4.17% - Blue Roan
4.17% - Black
4.17% - Bay Roan
4.17% - Bay
4.17% - Chestnut Roan
4.17% - Chestnut

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You have quite a few possible outcomes:
Chestnut
Black
Red dun
Red roan dun
Red roan
Grullo (black dun)
Grullo roan
Black roan
So basically, you could get a combination of the two modifiers (dun and roan), or just one of them, or none at all. If the stallion is homozygous for black, you'll get a black-base color foal, if not you have a 50/50 chance of a chestnut.
(edit) Also, I forgot... if one of the horses carries the Agouti gene you have a chance of getting a bay. So you can add bay, bay dun, bay roan, and bay roan dun to that list. Chestnut can hide Agouti so it's possible that your mare could be carrying it.

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I want to see a violet horse, personally :) Never been a good one at color genetics, but my vote goes for cremello or palomino just to be creative :)
More than likely you will get a grullo or smoky black (not that there's that much difference really between them).

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well there are like a bazillion different colors you could get based on genes and stuff. my grandma one bred a palomino stallion to her true black mare and they got a blood bay colt! talk about strange. but he was beautiful.
(FYI: for those who don't know a blood bay is a dark bay with a reddish tinge)

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That depends on the genetics of the parents. I use horsetesting.com to see my possibilities. If the sire is homozygous roan than you will have a variation of roan. If he is a black carrier than that has a factor also. Plus the mare may carry dun dilution or be a red carrier. If you go to the coat color calculator it will give you the possible offspring colors. Also, the only way for the sire to be homozygous for roan is if both parents were roan. I used your horses and got several possibilities because I didn't know the genetics for your horses. One was grullo!

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I guess you'll just have to see what she has huh?