Piebald

A piebald or pied animal is one that has a pattern of unpigmented spots (white) on a pigmented background of hair, feathers or scales. Thus a piebald black and white dog is a black dog with white spots. The animal's skin under the white background is not pigmented.

Location of the unpigmented spots is dependent on the migration of melanoblasts (primordial pigment cells) from the neural crest to paired bilateral locations in the skin of the early embryo. The resulting pattern appears symmetrical only if melanoblasts migrate to both locations of a pair and proliferate to the same degree in both locations. The appearance of symmetry can be obliterated if the proliferation of the melanocytes (pigment cells) within the developing spots is so great that the sizes of the spots increase to the point that some of the spots merge, leaving only small areas of the white background among the spots and at the tips of the extremities.

Animals with this pattern may include birds, cats, cattle, dogs, foxes, horses, cetaceans, deer, pigs, and snakes. Some animals also exhibit colouration of the irises of the eye that match the surrounding skin (blue eyes for pink skin, brown for dark). The underlying genetic cause is related to a condition known as leucism.

In medieval English "pied" indicated alternating contrasting colours making up the quarters of an item of costume or livery device in heraldry.

Etymology

The word "piebald" originates from a combination of "pie," from " magpie", and "bald", meaning "white patch" or spot. The reference is to the distinctive black-and-white plumage of the magpie.

Horses

In British English ''piebald'' (black and white) and '' skewbald'' (white and any colour other than black) are together known as ''coloured''. In North American English, the term for this colouring pattern is pinto, with the specialized term "paint" referring specifically to a breed of horse with American Quarter Horse or Thoroughbred bloodlines in addition to being spotted, whereas ''pinto'' refers to a spotted horse of any breed. In American usage, horse enthusiasts usually do not use the term "piebald," but rather describe the colour shade of a pinto literally with terms such as "black and white" for a piebald, "brown and white," or "bay and white," for skewbalds, or color-specific modifiers such as "bay pinto", "sorrel pinto," "buckskin pinto," and such.

Genetically, a piebald horse begins with a black base coat colour, and then the horse also has an allele for one of three basic spotting patterns overlaying the base colour. The most common coloured spotting pattern is called tobiano, and is a dominant gene. Tobiano creates spots that are large and rounded, usually with a somewhat vertical orientation, with white that usually crosses the back of the horse, white on the legs, with the head mostly dark. Three less common spotting genes are the sabino, frame, and splash overo genes, which create various patterns that are mostly dark, with jagged spotting, often with a horizontal orientation, white on the head. The frame variant has dark or minimally marked legs. The sabino pattern can be very minimal, usually adding white that runs up the legs onto the belly or flanks, with "lacy" or roaning at the edge of the white, plus white on the head that either extends past the eye, over the chin, or both. The genetics of overo and sabino are not yet fully understood, but they can appear in the offspring of two solid-coloured parents, whereas a tobiano must always have at least one tobiano parent.

Dogs

In many dog breeds the Piebald gene is common. The white parts of the fur interrupt the pigmented coat patterns. Dogs that may have a spotted or multicolored coat, are often called piebald if their body is almost entirely white or another solid color with spotting and patches on the head and neck. The allele is called sP on the S-locus and is localized with the MITF gene. It is recessive, therefore homozygous individuals show this coat pattern, whereas the heterozygous carriers can be of solid color.

File:Bucovina Sheepdog.jpg, Bucovina Shepherd Dog
File:Can Setter dog GFDL.jpg, Red Irish Setter without Piebald spotting
File:Irish Red And White Setter 2005.jpg, Irish Setter red and white due to the Piebald gene
File:Biewer Yorkie.jpg, A Biewer Terrier is a Blue and Tan Yorkie with white coat pattern.
File:Beagle 600.jpg, The Beagle is usually tricolor by the Piebald gene.
File:Jack Russell Jackie.jpg, Jack Russell Terrier with recessive red and Piebald spotting.

Other animals

Many other animal species may also be "pied" or piebald including, but not limited to, birds and squirrels. A piebald Eastern gray squirrel named Pinto Bean gained prominence at the University of Illinois Urbana-Champaign after many students shared pictures and videos of it online. Snakes, especially ball pythons and corn snakes, may also exhibit seemingly varying patches of completely pigmentless scales along with patches of pigmented scales. In 2013, a piebald blood python was discovered in Sumatra. Some domesticated silver foxes born from the Russian Institute of Cytology and Genetics also carry this coloring.

Bicolor cats carry the white spotting gene (incorrectly called the piebald gene). The same pattern that applies to cats also applies to dogs when the white spotting gene involved is indeed piebald and not another white-causing gene found in dogs. The piebald gene is also found in cows, ferrets, domestic goats, goldfish, guinea pigs, hamsters, rabbits, and fancy rats.

File:Bicolor cat - Black and White.jpg, Bicolor cat
File:Holstein heifer.jpg, Holstein cow
File:Hausmeerschweinchen drei.JPG, Guinea pigs
File:Mesocricetus auratus.jpg, Hamster
File:Salon agriculture 2009 - furet recentre.jpg, Ferret
File:Goat بز 09.jpg, Goat
File:Piebald Squirrel Pinto Bean.jpg, Squirrel
File:Piebald Deer.png, Deer

Holstein and Simmental breeds of cattle typically exhibit piebaldism.

See also

Horse coat

* Equine coat color
* Equine coat color genetics
* Pinto horse
* Tricoloured (horse)

Pigmentation

* Albinism
* Amelanism
* Dyschromia
* Erythrism
* Heterochromia iridum
* Leucism
* Melanism
* Piebaldism
* Skewbald
* Vitiligo
* Xanthochromism

References

Sources

*
*
** Chapter 146, "Introduction to Hypopigmentation"
** Chapter 147, "Albinism"
** Chapter 148, "Piebaldism"
** Chapter 149, "Vitiligo"
*

External links

* (extremely rare wild piebald moose photographed in northwest Alberta, Canada)

{{Equine coat colors

Animal coat colors
Bird colours
Cat coat types
Disturbances of pigmentation
Dog anatomy
Horse coat colors