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Maximum/minimum tobiano pattern

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bluebell
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Maximum/minimum tobiano pattern
My tobiano mare has had 2 foals by solid coloured stallions. The mare is 55/45 black/ white. One foal is 80% colour, 20% white. The other foal is 15% colour/ 85% white. I believe the expression of the tobiano gene is governed by modifying genes. The tobiano coat pattern can only have come from the mare in this case, and I am very surprised at the difference in the foals - I expected theem to be roughly similar :-? . Does anyone know how the modifiers work? Can they be contributed by the plain, non-tobiano parent? Also, does anyone know how the coat pattern is affected by environmental factors and what these might be? Thank you in advance.
CMhorses
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really need pictures for one,

really need pictures for one, the foals could have more than just tobiano and that can change how much white they have; it seems like the coat could greately be affected as when looking at clones, they all have different white markings of different sizes , suggesting that white placement and amount are somewhat influenced by enviornment, now i could see a developing foal with less nutrients having more white than a foal with more because it takes certain elements to make pigment producing cells, but this is also determined by genetics, so crossing with a "solid" there is a chance your foal inherits a lot of "produce more pigment" genes and thus has less white, or in the case of your more white foal he got more of the " produce less pigment" genes from mom and dad

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Monsterpony
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Second the pictures. The

Second the pictures. The sires may be "solid" or just minimally marked. Either sire could contribute more or less white suppression factors, which would make a big difference in color as well as other white patterns besides tobiano. The 80:20 foal sounds like it probably has another pattern going on in the mix.

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bluebell
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Foal piccies[img][/img]

THank you for your replies. Foal piccies to show difference in colouration. Very pleased with both foals, but very interested in the genetics.
No tobiano or sabino in either sire, not even minimal.
IMAGE(http://i226.photobucket.com/albums/dd62/leevale/foals/2.jpg)' alt='IMAGE(IMAGE(http://i226.photobucket.com/albums/dd62/leevale/foals/2.jpg))' />

IMAGE(http://i226.photobucket.com/albums/dd62/leevale/foals/1.jpg)

IMAGE(http://i226.photobucket.com/albums/dd62/leevale/foals/4.jpg)

IMAGE(http://i226.photobucket.com/albums/dd62/leevale/foals/3.jpg)

CMhorses
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well your mare is splash

well your mare is splash and/or sabino as well as tobiano, and we already know that completely solid horses can have splash or sabino

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Threnody
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By having face white your

By having face white your mare has more than just tobiano. As do her foals. I also agree with her likely having a splash and sabino combination.

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