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> Rabicano is a pattern of white hairs that's similar to roan. It consists
of
> white hairs on the flanks of the horse and at the top of the tail. The
white
> hairs on the flanks often spread onto the rib area, where they take on a
> vertical striping appearance. You said the mare is a Bay with 2 white
socks
> who is Pinto breeding stock Reg. Her Sire was a Tobiano 1/2 arab, dam was
a
> Chestnut. And you are breeding to a Black,carrying Rabicano Gene....
>
> My guess? You will get a bay.......but I am no color expert at all. What
are
> you HOPING to get??????
> As I understand color, at least with pinto, that unless the parent actually
HAS color on its own body, it won't throw color. Meaning, if you have a
> mare
who had a parent that was pinto, but she came out solid, and you bred to a
solid stallion, you won't have a chance to get color, as neither of them
HAVE color. But again, I am no color expert. I am sure there are some on the
list who understand this more. (so if one of the horses to be used in the
breeding actually HAS rabicano color, then it could throw rabicano??? I
think....)


I can't seem to find the original post.  But here are a few comments.

1)  There are several types of "pinto" patterns--tobiano being just one of
them.  While it is correct that tobiano is dominant, and therefore will be
expressed, hence if you don't see it, you can't pass it on, the others
(frame overo, splash overo, and sabino) are not so straightforward.  And to
be correct--pinto is not a color, it is a marking pattern.  In any event,
since the tobiano grandparent did not pass the trait to the bay mare,
tobiano is not an option here.

2)  With actual regard to color--there are two base color
possibilities--black, and absence of black (which is red).  Bay is just
black with a modifier gene called "agouti" that causes the black pigment to
segregate to the points.  Black is dominant.  At least one parent here
carries a recessive gene for red (chestnut) since there is a chestnut
grandparent.  We don't have enough information here to see if the other
parent does or not.  But in any event, odds are that the foal will be some
form of black (either black or bay) but chestnut is still a possibility,
given the information here.  The agouti gene is pretty common, so odds are
that the foal will be bay--but if the bay parent is heterozygous for agouti,
black is also possible.

3)  The inheritance of the rabicano trait is unknown.  Therefore we can't
say that there is a "rabicano gene".  Again, this isn't a color--but it is a
trait that could be passed on regardless of whether the foal is black-based
(black or bay) or red-based.

Bottom line--odds are that this foal will be bay, but black and chestnut are
not out of the question.  Rabicano roaning may or may not show up.  And
although a tobiano pattern is out of the question, a pinto is still possible
as sabino and rabicano sometimes go hand in hand.

Heidi


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