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Tobiano is a spotted color pattern commonly seen in pinto horses, produced by a dominant gene. The tobiano gene produces white-haired, pink-skinned patches on a base coat color. The coloration is almost always present from birth and does not change throughout the horse's lifetime, unless the horse also carries the gray gene.
Whether a horse visually appears to have the frame pattern or not, testing horses of frame or "overo" lineage is highly recommended. The statistical likelihood of producing a living, frame-patterned foal by crossing two frames is 50%, the same odds of producing a living, frame-patterned foal from a frame-to-nonframe breeding which carries no ...
Homozygous roan stallions were identified in both European populations of Belgian horses in 1977, and in North American, in Quarter Horse stallions. [11] [29] In some breeds, homozygous roans can be identified by an indirect DNA marker test. [1] Such horses, with the genotype Rn/Rn, produce 100% roan offspring. [1]
Horses with the homozygous recessive genotype (C/C) are not affected by cream. Heterozygotes (C Cr /C) have one cream allele and one wildtype non-cream allele. Such horses, sometimes called "single-dilutes", exhibit dilution red pigment in the coat, eyes, and skin to yellow or gold, while eumelanin is largely unaffected.
SW1 is the most common known variant. It is incomplete dominant, meaning it has different effects depending on whether one copy or two copies are present. Horses heterozygous for SW1 (one copy) may have a minimal splash pattern, or may be completely solid. Horses homozygous for SW1 (two copies) have the more extensive classic splashed white ...
If two horses with the frame overo gene are bred together, there is a 25% chance the foal will have lethal white syndrome. [4] Splashed white or splash overo is a group of patterns that tend to have white on the underside, as if a horse ran through white paint with its head lowered.
Horses with two copies of the cream allele can be collectively called double-dilutes, homozygous creams, or blue-eyed creams, and they share a number of characteristics. The eyes are pale blue, paler than the unpigmented blue eyes associated with white color or white markings , and the skin is rosy-pink.
Champagne is a dominant trait, based on a mutation in the SLC36A1 gene. [1] A horse with either one or two champagne genes will show the effects of the gene equally. However, if a horse is homozygous for a dominant gene, it will always pass the gene on to all of its offspring, while if the horse is heterozygous for the gene, the offspring will not always inherit the color.
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