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Post by stormyskies on Sept 11, 2013 9:39:25 GMT
Is it possible for a bay more to produce a tobiano foal from a bay stallion?
One of our liveries is adamant that her mare, who is bay, has only ever had coloured foals, regardless of whether the stallion was coloured. As this is what the mares previous owner told her.
So my question is can 2 solid parents have a patchy foal? I have no idea if offspring is meant to be overo or tobiano. Or what colour the mares parent are.
I am thinking it can't be tobiano as it the mare had the tobiano gene, then she would be patchy herself. But overo may be different? I have a vague recollection that horses can carry the overo gene without being overo themselves, but I my just be making that up!
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Post by beckylock on Sept 11, 2013 16:32:24 GMT
If they are bay they will only have a plain foal unless the stallion is coloured.
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Post by sevesstud on Sept 11, 2013 18:06:19 GMT
One parent must carry the tobiano gene for a coloured foal. Are you sure the mare/stallion isn't very minimally marked?
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Post by stormyskies on Sept 11, 2013 19:37:28 GMT
No I think the guy filled her full of sh1t and she has believed him lol
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Post by pattendown on Sept 11, 2013 23:09:19 GMT
is the mare sabino as sometimes a loud sabino can mimic tobianos although obviously not
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Post by meljolly on Sept 12, 2013 7:24:25 GMT
It is possible for a coloured horse to be so minimally marked that it is mistaken for a solid colour, although obviously not very common.
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Post by caroline on Sept 16, 2013 12:35:38 GMT
i know of black show jumping pony mare with about half a dozen white hairs in her mane (you would have said it was a rug rub mark)produce 3 coloured fillies to a bay pony stallion. meljolly is right some tobianos can be so min marked that they are classed as plain, a friend had a lovely sporran foal that only had 4 white socks but tested as hetrozygous (so was a min tobiano)
stormyskies yes the overo gene can skip generations
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sarahp
Happy to help
Posts: 9,510
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Post by sarahp on Sept 19, 2013 11:11:05 GMT
Tobiano is easy to sort out as it can be tested for.
Overo is really a family of related white pattern genes, normally thought of as three different patterns - frame overo, splashed white and sabino, which is another multigene family of its own. So the inheritance is very complicated and variable, and it's also thought possible that there is a gene that will stop a horse that carries sabino genes from expressing them, just to make it even more interesting and unpredictable. We have had two Ds here by the same plain bay stallion, one plain bay and one a VERY loud chestnut, who has thrown on her loud white markings to her son by my much plainer stallion. I know the bay stallion's owner thought he may carry this masking gene.
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