First up, dappled greys.
I mentioned this very briefly in part two, but it merits a slightly longer note, since greys are pretty common (let's face it, if you have a British 1815 army, you need to paint some greys!).
|Classic dappled grey|
Wikipedia: Fabio Vidigal
CC BY-SA 2.5
Much as it's tempting, and fun to paint, the odds are that even in a unit of grey horses, not all the horses will dappled.
Next up, the truth about the A gene, and seal brown horses.
Since I first started coding equine genetics online in the mid/late '90s, there's been some further research and discovery of aspects of the 'Agouti' gene, the A gene that determines the pattern of black pigment on horses. And just when you thought part one all made sense...
|Seal brown horse|
Wikipedia: public domain
- A+ - the original 'wildtype' A gene, dominant over everything, produces very restricted black pigmenting on mane, tail - seen in Przewalski's horse
- A - the 'classic' bay as discussed in part one of this series, dominant over everything below it
- At - less restricted black points, produces a 'seal brown' horse, dominant over...
- a - no black points
So, our classic bay could be AA E, AAt E or Aa E. The seal brown (i.e. AtAt E or Ata E), is visually and markedly different from either a bay or a black - it commonly has a dark brown coat, dark-to-black mane and tail, but touches of red around the eyes and muzzle, as well as parts of the underneath. In some parts of the world, this is called a 'black and tan'.