Bokt.nl

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the head usually has no more white than expected in a nonspotted horse,

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Gene TO: Tobiano Spotting Pattern
[...]The legs are white, but the head is usually dark except for a facial marking pattern.

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Generally, face markings are just like a solid-colored horse (solid, blaze, strip, star or snip)

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Ik denk dus dat er bedoeld wordt dat tobiano zelf geen aftekening op het hoofd geeft, zoals sabino of splashed dat wel kunnen doen. Maar een aftekening als sterretje, bles, streep, sneb etc kunnen volgens mij optreden zonder het sabino-gen en kunnen dat (dus) ook op een tobiano.

IcePrincess schreef:

Een homozygoot voor tobiano paard kan nooit stiekem toch tovero zijn.

Citaat:

Like the other patterns Tobiano has various levels of expression. A horse that is tobiano alone can have 4 completely white legs without assistance from any other pattern. There are tested minimal tobianos with as little leg white as two rear cornets. Minis are one of the few breeds capable of restricting tobiano expression to the point of causing a tobiano to have solid legs. (American and UK Shetlands are also both capable of this but it is a rarity in big horse breeds).

Tobiano alone will have crisp edged markings. Many tobianos are also sabino even if they do not show sabino face white.

Just because an article online (based of APHA's descriptions of pattern which are totally inaccurate) says a tobiano can have face white doesn't mean that the tobiano pattern genetically causes face white. Tobiano does not cause face white. Face white on a tobiano indicated the presence of one of the other pinto patterns - most often the culprit is sabino.

For those who don't believe that "normal" face white is the result of sabino need only look at some Sb1 tested Tennessee Walking Horses to see that sabino is indeed the cause of many "normal" markings. Also go take a peak at some of the Maximum White Sabino Thoroughbreds and their parents and produce. Most sabinos with "normal marking" level expression are only going to produce that level but crossed to the right mate that normal expression can explode into pinto level expression - ie Crop Out pintos.

For those that are confused by this or having trouble accepting it take a step back and throw the term "overo" from your brain because it really is a meaningless term genetically. It is a blanket term for three patterns - Splash, Frame and Sabino. Pinto level expression for all of these patterns is the exception, not the rule. Frame can't create pinto level expression without help from one of the other patterns, Splash needs to be homozygous to create pinto level expression, sabino is a complex that require in most cases several gene pairs to line up right to create pinto level expression (the exception being Sb1 which when homozygous creates maximum white expression with no assistance but this is rare in miniatures).

As others have recommended - http://www.equinecolor.com is a great site. http://www.horsecolor.com is another very good site.

Meavey schreef:

Verder erger ik me verschrikkelijk aan de wiki eigenlijk staan mij veel teveel fouten in bv bij sabino word splash genoemd wat helemaal niks met sabino te maken heeft, ik kijk er maar niet naar dus.

Shadow0 schreef:

Meavey: bedankt voor je bijdrage, daar ga ik zeker naar kijken. Toch blijft het onduidelijk. Weet jij iets over de genetica van kleine aftekeningen op het hoofd? Dat zijn toch niet allemaal sabino's?

Meavey schreef:

En ik denk dat 90% van alle paarden idd sabino is en heeft hoor dus grote kans.

Citaat:

Aftekening op het hoofd worden niet door het tobiano-patroon veroorzaakt

Meavey schreef:

bij sabino word splash genoemd wat helemaal niks met sabino te maken heeft