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Curious about "brown" genetics (in game and IRL) - Horse Genetics Game - Forum
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Curious about "brown" genetics (in game and IRL)
  • I've been curious about genetics in-game that lead a horse to be labeled as brown, instead of e.g. bay. I read a little on the genetics guide about ASIPt - does this just effectively create a darker/very dark bay, which we call brown? Would a dark bay horse with e.g. DP/sooty still be considered bay? But from what I can tell chestnut horses are never labeled brown, even if they are very dark and visually looks dark "brown" or even black - is that correct? Basically just curious what genetics lead a horse to be considered brown.

    I'm partly curious about this because my first horse IRL was called, colloquially by people in our horse community, a "black bay" which I think is a term that's fallen out of favor because it's confusing lol. Her coat was very, very dark (looked truly black) but her nose was a much lighter brown. Her mane and tail also appeared black but in the summer would take on a brown tint sometimes, maybe just sun bleaching. Her legs were also black but she had white socks so hard to say if the color gradient changed noticeable on her legs compared to her body (which really looked black anyway). While I've been playing this game it's been making me wonder about what her genotype might have actually been!
  • This Google Sheet may be very helpful for you: https://docs.google.com/spreadsheets/d/1EHr5iP5D8NNHME1LWc-6tgpwupd_BdZpuMKeqNBnZuI/edit?pli=1&gid=0#gid=0

    Brown horses in the game will always have at least one dominant copy of Extension (E) and Agouti (A). Extension determines IF black pigment is expressed, Agouti determines where that black pigment CAN express if it is present. DP and sooty are darkening genes in the game, and some combination of darkening genes will get you a brown horse vs. a bay horse.

    The very dark chestnut horses you're noticing are not labeled brown because you need dominant Extension to get brown, which they do not have. All chestnut horses have two copies of recessive Extension (e/e) and do not express black pigment.

    As for brown in real life horses, I've been out of touch with that scene for a while. I remember there being some evidence to suggest it is linked to whether a horse is homozygous dominant for Extension vs heterozygous (E/E vs E/e).
    IMG-0214
    Formerly AlAsseelStable
    Thanked by 2Ogidni Ammit
  • Very cool, thanks so much for the chart I had no idea that existed and is very thorough! I was suspicious just from my fairly casual scan of genetics in the game that brown required E and A and it's nice to see the full combinations mapped out.

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