01-20-2013, 05:51 PM
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I would say your chances would be slim, even if you bred to a grulla.
Being a buckskin, your mare is for sure carrying one black gene (possibly 2) agouti and cream.
To be a grulla they must have atleast one black gene and dun. No agouti.
If you bred to a grulla there would still be a good chance that you would not get a grulla but probably a bay dun or a dunskin.
Your best bet would, as CLaPorte423 said, would be to buy one.