[prettyqtrs]

I am adding some color information to our website. I don't remember seeing a horse advertised as homozygous roan or homozygous grey. Are they possible?
I'm thinking, sure they are...you just have both parents throwing a roan gene or the grey gene/modifier at the same time. But then, I'm thinking...hmm, I don't recall seeing a horse advertised as homozygous roan or grey (though I know there is no test to prove it, but from large amounts of foals...they could have produced all roans or all greys).

Thanks in advance!

[Little Red Dun]

I know homozygous gray is definitely possible. I've seen many Arabians that produced nothing but gray foals, even when bred mainly to non-grays. I've heard that homozygous grays go "white" faster, but I have no idea if this is true.

As for homozygous roan, I have seen a few stallions that claimed to be homozygous roan and produce nothing but roan foals. However, I also remember reading somewhere that there was a study that showed homozygous roan was lethal and resulted in early abort or absorption?

I think the reason homozygous gray is not advertised is that it is not as desirable. A lot of people prefer non-grays. As for the roan, with no test, I do not think stallion owners want to take the risk. Even if they produce 100 roan foals, if the next one happens to be non-roan, the mare owner would raise a fit I am sure.

[prettyqtrs]

Okay, thank you.

Would I be safe to put this?

There are three registerable roan patterns/colors: Blue Roan (Black + 1 or 2 copies of roan gene), Red Roan (Sorrel/Chestnut + 1 or 2 copies of roan gene), Bay Roan (Bay + 1 or 2 copies of roan gene).

There is one registerable modifier/color: Grey (Any color + 1 or 2 copies of grey gene/modifier).

Or should I leave the roans with "+ 1 copy of roan gene"? I also plan on stating that there are no coat color tests available for roan, grey, or dun.

[Little Red Dun]

That sounds reasonable to me. It is entirely possible for gray to be homozygous and maybe roan too.

It is not a proven medical fact (as far as I know) that homozygous roan is lethal; I just remember reading an article about it. So I think it would be safe to say +1 or 2 roan genes, etc.

I will see if I can find that article about homozygous roans for you.

[Little Red Dun]

Here is some information about homozygous roans: *Hancock Horses .com**|**ARTICLES**|**The equine roan gene

Basically, the old theory was it was lethal. However, there are new studies out saying that it is possible for a horse to indeed be homozygous for roan.

Hope that helps.

[Acme Acres]

Heza Jetwind was a Gray QH stallion that was advertised as homozygous gray. We had a son of his. He grayed out to "white" by the time he was 3.

[PeggySue]

roans can be ANY color including your dilutes... which makes it a modifier

silver is also a modifier

[Haas Horse Farm]

Originally Posted by prettyqtrs

Okay, thank you.

Would I be safe to put this?

There are three registerable roan patterns/colors: Blue Roan (Black + 1 or 2 copies of roan gene), Red Roan (Sorrel/Chestnut + 1 or 2 copies of roan gene), Bay Roan (Bay + 1 or 2 copies of roan gene).

There is one registerable modifier/color: Grey (Any color + 1 or 2 copies of grey gene/modifier).

Or should I leave the roans with "+ 1 copy of roan gene"? I also plan on stating that there are no coat color tests available for roan, grey, or dun.

But the problem is any color can also be roan... even though those may be the only colors recognized by AQHA. I think if you are going to go there you need to state that roan may combine with any color such as a silver grullo roan varnish tovero appaloosa.

[Little Red Dun]

Originally Posted by Haas Horse Farm

any color such as a silver grullo roan varnish tovero appaloosa.

Wow, I can't even imagine what a silver grullo roan varnish tovero appaloosa would look like!

[Haas Horse Farm]

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