Magical gene / fields and regions

Dutch

A hard-edged white band right round the body at the shoulder, widest under the chest and narrowing over the withers, with white stockings and a white muzzle to match. A third allele carries the same marking worked in greys instead of white - dark where the pale form is light, and the same number of steps.

What it can come out as

OutcomeCarrying
DutchDut/Dut · Dut/Dtc · Dut/n · Dut/Dtk
Black DutchDtk/Dtk · Dtk/Dtc · Dtk/n
Coloured DutchDtc/Dtc
Wild typeDtc/n · n/n

How each one is actually drawn - region by region, and the layers it is built from - is on the coding tab.

Crossing two of them

Finding one

About 1 in 893 wild horses is born showing this. That is the whole of the supply: catch one, or make one with the carrot below. Breeds set their own pools and a breed built around this gene will carry it far more often than the wild population does.

Wild pairShows asHow often
Dut/DutDutch0.004% — 1 in 25,000
Dut/DtkDutch0.0053% — 1 in 18,751
Dut/DtcDutch0.0053% — 1 in 18,751
Dut/nDutch0.076% — 1 in 1,316
Dtk/DtkBlack Dutch0.0053% — 1 in 18,751
Dtk/DtcBlack Dutch0.0053% — 1 in 18,751
Dtk/nBlack Dutch0.0053% — 1 in 18,751
Dtc/DtcColoured Dutch0.0053% — 1 in 18,751
n/nWild type99.888%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/dutch.json — a data-driven gene, not a Java class. It is listed in the index.json beside it and registered by Genes' class initialiser at startup.

Keyhorsegenetics.dutch
Phasemagical — it adds signed colour in phase 3, after the pigment has resolved
Priority253 — where it sits in the one (priority, key) paint order
AllelesDut · Dtk · Dtc · n
Varies per horse3 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built fromAXIS, CENTERLINE, PARTS, TOWARD

Why it is built this way

The black allele is the white one with the light taken out of it, and it sits one rung under white in the dominance series - so every combination that existed before it keeps the outcome it had, and only the pairs carrying Dtk are new. The re-toning is a mapping rather than a repaint: every achromatic target moves into the dark end of the scale keeping its order and its spacing, and every SATURATED one is left alone, because that colour is the gene rather than its lightness.

What it paints

Each outcome, described the way the gene file describes it, and then the layers that draw it in the order they are painted. The prose is the part a reader checks a bake against; the list underneath is what the engine actually did.

Dutch

The rabbit pattern. A band wraps the body at the shoulder and chest, front edge at the base of the neck and back edge at the girth, broadest underneath and pinching as it climbs to the withers - and on a minimal horse it fails to close over the topline at all, leaving a bridge of coat there. White runs forward along the underside of the neck to the throat, takes the muzzle, and often a stripe up the face. All four legs are stocked to somewhere between mid-cannon and the knee, and the front and hind heights rarely match. Every edge is hard - no roaning, no feathering - and every one of them is a smooth curve. The barrel, flank, hindquarters, mane and tail keep the coat entirely.

  1. the band round the shoulder and chest — AXIS × AXIS × AXIS, painted with TOWARD
  2. white forward along the underside of the neck — AXIS, painted with TOWARD
  3. the muzzle and a stripe up the face — PARTS × CENTERLINE, painted with TOWARD
  4. stockings, uneven front to back — AXIS, painted with TOWARD

Black Dutch

The same marking as the white form with the light taken out of it: a single near-black tone.

  1. the band round the shoulder and chest — AXIS × AXIS × AXIS, painted with TOWARD
  2. white forward along the underside of the neck — AXIS, painted with TOWARD
  3. the muzzle and a stripe up the face — PARTS × CENTERLINE, painted with TOWARD
  4. stockings, uneven front to back — AXIS, painted with TOWARD

Coloured Dutch

The same band, muzzle and stockings, in a colour the line carries rather than in white. Fully recessive - two copies, and a single copy beside the white allele shows white. It never gives blue eyes.

  1. the coloured band round the shoulder and chest — AXIS × AXIS × AXIS, painted with TOWARD
  2. colour forward along the underside of the neck — AXIS, painted with TOWARD
  3. the muzzle and face stripe, coloured — PARTS × CENTERLINE, painted with TOWARD
  4. coloured stockings — AXIS, painted with TOWARD

Wild type

No band.

Paints nothing.