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On 1/10/06, heidi@xxxxxxxxxxxxxxx <heidi@xxxxxxxxxxxxxxx> wrote:
So talking about a
> "sabino gene" is not accurate.
It may not be entirely accurate, but it is useful for conversational
purposes when we cannot launch into extensive detail. It does tend to
breed true (i.e. at least one parent must show at least minimal sabino
patterns to produce sabino offspring). True enough for clear patterns
to be recognized that are not due entirely to chance. And I have yet
to see a clear instance where sabino popped up randomly where neither
parent showed even minimal signs of it, although if you look at the UC
Davis paper that I referenced, overo seems to be a relatively common
mutation in QH's that will then breed true - perhaps something such as
this occurs with sabino, or the gene(s) that cause it. We just don't
know.  What Kris, and you have missed is that I never indicated that
the original posters mare did NOT have the gene, merely that it was
not certain that she did. I would guess not, but as I indicated, I
recognized that there was no way to be certain.

I also noted in my original response that (in my opinion) there were
likely more or different genes involved due to the variations found in
different breeds.

It would be beneficial to read clearly before responding, as I offered
only my opinion, and references to what is known and what is not
known. My opinion is that her mare may or may not be sabino, will
likely not produce any pinto pattern offspring when bred to non-pinto
stallions, and is probably rabicano. All the other arguing is somewhat
irrelevent, because I stated no definitive statements on the matter,
merely shared information and references. Using the expression "sabino
gene" is a convenience for the purposes of conversation that is fairly
accurate as most horses that express sabino in one way or another can
and do reproduce it and most horses that do not, do not produce it. In
fact, I even recognized that there was no test for it, and that there
may indeed be additional genes or modifiers attached to it. It is all
theory at this point, but the evidence is that sabino is not a hidden
trait. If a horse has "it" (whatever you want to call "it" ) they are
going to show it, at least minimally. Whether it is one gene or
several or a group of them is unknown.

~S

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