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I would say that his dam carries Het DP, as her dam was a FF RS (hom DP liver) and she only has one Sty. So for her to present as a 'dark chestnut', she would carry one copy of sty and one DP. To be a 'liver', a horse needs to have two Sty Sty and one DP.

She would have passed that DP onto the foal, as well as her Sty gene, and the foal's sire would have also passed on his Sty gene. Hence why he is now liver :D

@jahdaz that's what Aztec is saying though. His grandmother, Freaky Tika Tala has 2 copies of DP since she's a freaky friday RS. That means that this horses mother (tika scorpion) has 1 copy of dp, which most likely was passed down to this foal. It's near impossible to tell if there is DP in the fathers line, since there are many blacks and champagnes, which cause dp to not express.