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What is DP?
  • friesianpaintsfriesianpaints
    I've been trying to figure it out from pics but so far not positive on if I know what it is. Is it dappling or something like that?
  • SandycreekFarmSandycreekFarm
    It doesn't have anything to do with dapples, which can occur spontaneously in every color, I believe.

    DP stands for Dense Pheomelanin. Pheomelanin is name of the pigment cells that turn horse hair (and probably that of other mammals) red. DP causes the red pigment to continue building up in the hairs, making them much darker than normal.

    There are two darkening genes--Sooty (Ssty) and DP. Every horse has two alleles of both genes, one from its sire and one from its dam. when a chestnut horse has three darkening alleles, it is a Liver Chestnut. It can be SstySsty DPdp or Ssty DPDP. If it also carries Cream, you will have a Chocolate Palomino. Chestnut and Palomino horses that are homozygous for both darkening genes will appear black.

    There is no gene test for DP.

    Some examples.

    Liver Chestnut with Pangare
    image
    http://hj2.huntandjump.com/horse.php?horseid=608768

    Liver Chestnut without Pangare
    image
    http://hj2.huntandjump.com/horse.php?horseid=603439

    Liver Chestnut SstySsty DPDP
    image
    http://hj2.huntandjump.com/horse.php?horseid=601221

    Chocolate Palomino
    image
    http://hj2.huntandjump.com/horse.php?horseid=597098

    Chocolate Palomino, possibly DPDP
    image
    http://hj2.huntandjump.com/horse.php?horseid=588742

    DP also affects the darkness of Bay coats, but since there is no special name for them horses that carry it can be difficult to learn to identify.

    Even Black horses can carry it, but, since they have no red hair, it doesn't affect them, just as Flaxen doesn't.
    De gustibus non disputandum. "There's no arguing about tastes."

    SandyCreek Farm: ID# 441
    also playing H&J1 as SandyCreek Acres: ID# 137592
    Thanked by 1TallTreesYard
  • DenalidomDenalidom
    Apparently there is a mechanism behind dapples - I remember Ammit saying that it could be selected for, kind of like spot size in appaloosas. I'd be curious to see how big they can get.

    Also, DP can affect any red pigment, so champagnes, bays, browns, buckskins etc can show it, there's just no change in the name of their color.
    Thanked by 1SandycreekFarm
  • ColorGoodStablesColorGoodStables
    Here are a few more DP examples

    syysty with DPDP and roan
    image

    All freaky Friday horses are also homozygous for DP. Even if they're black like this mare
    image

    This colt is also DPDP but he is showing very bold dappled as well as silver
    image

    This is a brown horse with double DP as well
    image

    Silver black with dappled and at least one copy of DP
    image

    I have more but don't want to hunt them down lol. Hope these guys provide some visual reference. I try to breed for DP as much as possible. My goal is black chestnut
    ----
    Barn ID 4953
  • ColorGoodStablesColorGoodStables
    Oh and every liver horse need 3 darkening alleles
    The darkening alleles are sty S+ and DP
    ----
    Barn ID 4953
  • AmmitAmmit
    Melanocyte is the name of pigment cells. Pheomelanin is the name for red/brown/orange pigment specifically.

    ___________
    Need to contact me? Read this first.
    http://www.huntandjump.com/forum/discussion/3/how-to-get-help-from-an-administrator
    Thanked by 2SandycreekFarm Denalidom
  • friesianpaintsfriesianpaints
    Thanks! That helps a lot

    And colorgood that brown silver dapple is gorgeous! Love the contrast of color on him
  • ColorGoodStablesColorGoodStables
    He's basically my pride and joy! I plan on doing a small pasture breeding with him this soon I haven't gotten around to it yet.
    He's open for public stud (for super cheap) watch season or you can get straws if you're ever interested
    ----
    Barn ID 4953
  • MoonAcre StablesMoonAcre Stables
    He really is gorgeous ColorGood! I may have to breed to him this season!
  • friesianpaintsfriesianpaints
    Once I have room again I might have to breed to him, so pretty!
  • ColorGoodStablesColorGoodStables
    Go ahead guys! I'd love to see what you get. Just please free test them, I know you already do but still
    Help yourselves to him
    ----
    Barn ID 4953
  • jezmynespice1jezmynespice1
    here's a filly i bred last season out f two chocolate pali parents, she's Ssty Ssty DPDP
    image

    and here's a filly i bred this season out of a white spotted liver chestnut sabino stud and my chocolate pali mare, pretty sure she's Ssty Ssty DPdp
    image
    Celestial Performance Horses
    ID 15335
  • DenalidomDenalidom
    @jezmynespice1 Since she's SstySsty and not liver then she doesn't carry DP. They need to have any 3 in combination to be eligible for the breeder's club. The first mare, however, is homozygous for both.
    Thanked by 1jezmynespice1
  • jezmynespice1jezmynespice1
    oh, thanks Denali, i thought she was at least heterozygous for DP but i guess not :-)
    Celestial Performance Horses
    ID 15335
  • friesianpaintsfriesianpaints
    Ok so making sure I understand for sure...

    All liver chestnuts are STYSTY DPdp

    The liver chestnuts that look black are STYSTY DPDP?

    Like this filly I just got?
    image
  • SandycreekFarmSandycreekFarm
    Exactly right! Congratulations!
    De gustibus non disputandum. "There's no arguing about tastes."

    SandyCreek Farm: ID# 441
    also playing H&J1 as SandyCreek Acres: ID# 137592
  • KerredansCorralKerredansCorral
    Liver chestnuts can be StyS DPDP , there just needs to be 3 darkening genes, but yes, your little girl there is StySty DpDp. Very Nice!
  • friesianpaintsfriesianpaints
    Awesome, thanks
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