Color Genes
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Color Genes

Color Genes
[Aa/AA]
Agouti 		This gene restricts black pigment to a horse's lower legs, mane, and tail. This means that while a chestnut horse can carry the dominant Agouti gene, the bay coloration will only be visible on a horse that carries one extension gene.

If a horse is recessive for the agouti gene they will appear black if they carry one dominant E gene, if the horse is recessive for both extension and agouti they will appear chestnut.
[Ee/EE] Extension This gene is responsible for deciding whether the horse will be red or black. A horse with at least one extension gene and one agouti gene will result in a variation of bay.

Horses that are homozygous for Extension will produce foals that have bay or black based coats and will never produce a chestnut foal.
[Gg/GG]
Grey 		This gene is responsible for a whitish or roan look on horses. When first born horses usually appear solid in color but as they age they will lose their original pigment as the whitish hairs grow in. Horses on FFH may grey out slow, moderately or fast depending upon the gene they received.

Homozygous greys will always produce grey offspring. Grey will also override any other coat color, so make sure to look at the genes!
[CRcr/CRCR] Cream This gene is an incomplete dominant. This means that a single dominant allele will have a different effect than two dominant alleles. If one copy of the cream gene is active, it produces a beautiful golden pigment (buckskins/palominos) or dilutes a black horse's coat slightly to a more brown look (smoky black).

If two cream genes are active on a horse it produces a double dilute (perlino, cremello, smoky cream). Horses that are homozygous for cream will always produce buckskin, palomino, or smoky black offspring.
[Rr/RR]
Roan 		This gene causes white hairs to grow into the normal coat of a horse while leaving the head, legs, mane and tail a solid color. This is not to be confused with grey! Horses on FFH that are homozygous for roan will always produce roan offspring and appear more white on the body. Horses with one copy of the gene can still appear roan as either light or moderate.
[Dd/DD]
Dun 		This gene is responsible for "primitive"-like markings on a horse. You can tell a horse is a dun by its dorsal stripe, leg barring, shoulder stripe, ear barring, forehead spider-webbing, and a face mask. Horses that are homozygous for dun will always produce dun offspring.
[Zz/ZZ]
Silver 		This gene causes the mane and tail of a horse to appear light in color despite its actual coat color, giving it a striking appearance. Highly sought after, these horses usually tend to sell high.

To maintain silver rarity, Lethal Silver Syndrome was introduced. Breeding two silver horses together can result in a dead foal, an injured mare, or both. Breeding two silvers together is not recommended!

Chestnut based horses (chestnut, palomino, red dun, etc) will not express a silver coat! They will however still carry the silver gene and then potentially be able to pass it on to offspring.
[CHch/CHCH]
Champagne 		This gene is responsible for lightening a horse's coat similar to the cream gene. Although similar to the cream and dun dilutions, the Champagne gene has certain characteristics that distinguish it from other dilutions, such as having mottled or pink skin near its eyes and mouth. They also have hazel eyes.

To maintain Champagne rarity, Lethal Champagne Syndrome has been introduced recently. Breeding two champagne horses together can result in a dead foal, an injured mare, or both. Breeding two champagnes together is not recommended!
[Ff/FF]
Fae 		This gene is exclusive to the Goldblood breed. This gene produces the colors known as Rose, Lilac, Sylph, and Morpho, which show up on red-based, bay-based, and black-based horses respectively.

Fae also come in three shades, Bright, Dusk and their base shade for each color. All homozygous Fae will be Bright. Although it is dominant over (and will not show) Cream, Dun, or Champagne, all three versions can visually show characteristics of Silver, Roan, or Grey.

Each color corresponds to a different base: Rose is Red-Based, Lilac is Bay-Based, Sylph is Black-Based with Cream, and Morpho is Black-Based.
[Oo/OO]
Opal 		This gene is exclusive to the Goldblood breed. Opal produces a range of 5 different Opal colors: White, Fire, Black, Crystal, and Boulder.

Opal is dominant over (and will not show) Cream, Dun, Silver, and Champagne, Opal-colored horses can still exhibit Roan and/or Grey.

The unique shades of Opal are not tied to the typical Extension and Agouti base genes, but instead to the Opal Tier modifier. There are 5 different rarity tiers within Opal, each producing the above-mentioned colors. Horses with a higher tier have better chances of passing on higher tiers and thus the rarer variations. However, tiers still pass somewhat randomly so even if you cross two Tier 5 - Boulder horses you could end up with a foal of any Opal variety.
Crossing Colors
Color transference on FFH is not as straight-forward as real life. Crossing a single cream to a non-cream will not make it 50% cream and 50% non-cream chance, the chance of getting an uncommon or rare color is lower. The current rarest color is champagne followed by silver and dun.
Reloading Horse Pages
All horses need to have images reloaded at 2 years old to show their adult coat and markings. Greys need to have their images reloaded YEARLY. A red message will appear once a yearling ages up to two years old that will have a button that you can click in order to see their adult coats. This will show up yearly for grey horses.
What are Modifiers?
Modifiers are genes that have multiple alleles present that are (usually) co-dominant to one another. A horse with a modifier will usually display a trait that is distinctly different from a horse without a modifier. The presence of an "m" means a modifier is present on one allele. An "M" means it is present on both alleles. In most cases, the modifier must be present on all dominant alleles in the gene to show up.

In other words, a homozygous gene must have an "M" modifier to be impacted by it, while a heterozygous gene only needs an "m" modifier. A modifier can also be attached to a recessive gene. In those cases, the horse is typically a carrier - meaning the modifier is not visually present but can be passed on.
Modifiers
Extension+M1 Extension with a(n) M1 modifier turns the coat to a Flaxen Chestnut. The gene expresses itself by making the mane and tail lighter on a chestnut coat.
Extension+M2 Extension with a(n) M2 modifier turns the coat to a Liver Chestnut. The gene expresses itself by making the coat a reddish-darkbrown appearance, though not to be mistaken for a dark bay!
Agouti+M1 Agouti with a(n) M1 modifier turns the coat into a Dark Bay.
Agouti+M2 Agouti with a(n) M2 modifier turns the coat into a Wild Bay. This gene expresses itself by restricting most of the black pigment only to the horses' fetlock. Normal bays and dark bays the black pigment reaches all the way to the knee-caps.
Grey+M1 Grey with a(n) M1 modifier turns the coat into a Fleabitten Grey. Fleabitten greys have red speckling through-out its coat giving its namesake appearance.
Frosting+M1 Frosting with a(n) M1 modifier turns the mane into Glosting. This gene expresses itself by turning the silver frosting into a golden color.