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This helps to account for allegedly solid horses producing spotted offspring, called cropouts. [7] The long-standing practice of categorizing Paint horses in this manner contributed to the incorporation of the word "overo" into some of the titles used to describe the disease, such as overo lethal white foal syndrome. [4]
The case horse in Hardland's 2006 case study had one blue eye, while the other was parti-colored, but the horse was bilaterally deaf. [10] Some variants of splashed white may produce non-viable embryos if homozygous. SW1 and SW2 have been found in homozygous form, but SW3, SW4, SW5, and SW6 may or may not be homozygous lethal.
Furthermore, when a horse is homozygous for tobiano coloring, all of that horse's offspring will be spotted, with only a few exceptions: if either parent passes the dominant gray gene to the foal, then its spots will be visible while it is young, but will gradually become lighter until finally, as the gray gene acts upon all coat colors, the ...
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]
This Thoroughbred stallion (W2/+) has one form of dominant white.His skin, hooves, and coat lack pigment cells, giving him a pink-skinned white coat. Dominant white (W) [1] [2] is a group of genetically related coat color alleles on the KIT gene of the horse, best known for producing an all-white coat, but also able to produce various forms of white spotting, as well as bold white markings.
Overo refers to several genetically unrelated pinto coloration patterns of white-over-dark body markings in horses, and is a term used by the American Paint Horse Association to classify a set of pinto patterns that are not tobiano. Overo is a Spanish word, originally meaning "like an egg". [1]
A regular registry Paint. In addition to bloodlines, to be eligible for the Regular Registry of the American Paint Horse Association (APHA), the horse must also exhibit a "natural paint marking", meaning either a predominant hair coat color with at least one contrasting area of solid white hair of the required size with some underlying unpigmented skin present on the horse at the time of its ...
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.