06-12-2009, 09:37 PM
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Breeding for color is one of the WORST ideas ever thought up. It's a complete gamble, and unless you're breeding chestnut to chestnut, there are rarely guarantees (except in cases of homozygous of course, but again, depends on both breeding partners).
Seeing as how your mare is bay dun, she's no "fancy" color. Which means the chances of having a "fancy" colored foal from her are pretty slim. To have a grullo, she would have to be bred to a black based stud, and there are no guarantees she won't just throw her agouti on the foal and give you another bay dun. Even if the sire is homozygous for black, you have about a 50% chance of getting a bay dun again, with about an 18% chance for black dun (grullo). There is no way to know if she'll pass her agouti on or not. And if she's homozygous for agouti, you'll never get a black based foal out of her.
If you bred her to a cremello, you'd get the best chances at a "fancy" colored foal, as it's most likely to be a palomino, palomino dun, or buckskin (if she's homozygous for agouti, it's much more likely to be a buckskin).
The point is, you should be breeding for athletic ability and prowess, not for a "purty" color, because there is NO guarantee you'll get a "purty" color, and then you're stuck with not only a boring foal, but an ugly foal that nobody wants because you chose the palomino stud over the twice as nice boring chestnut stud.
So think it through, since you're most likely to just get another bay dun anyway unless you can dig up a decently conformed cremello stud.