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White patterns take 2

CMhorses Wed, 02/25/2009 - 15:28

I think tobi and frame and splash are fine but I would like to see more about roan and appy.
For roan I'd like to see more about the different colors,like red roan,blue roan...etc... and the characteristics of them, like sorrel base coat with points darker than main body...
For LP I would like to see more about the individual types of it. Also the fact that it can change the base coats appearance...remember the sorrel looking horse that tested black?

Daylene Alford Wed, 02/25/2009 - 15:47

I did state that roan leaves the legs, head, and usually the mane and tails solid color. It does not darken the points on chestnut horses. Just leaves them solid color.

I don't feel its necessary going into detail on what base color can carry roan since you have an infinite number of combinations and I don't want to give people the idea that only basic colors can carry it. I did state at the top of the article that all the white patterns can occur on any base coat. If someone can find a good picture of a red roan I will add it.

I can add a bit about LP affecting the base color but since it doesn't occur all the time its not
really an identifying characteristic of LP. I'll leave that one up to the appy people here...Those of you who are more familiar with appy colors then I am, should it be added to the description of LP? If so what would be a good way of putting it.

Monsterpony Wed, 02/25/2009 - 16:27

I wouldn't actually say PATN-2 or anything about that as it is just a theory and blanket can be different sizes. Not everyone knows what a snowcap or few spot is so I would mention that heterzygous Lp are those that have white patterns with spots inside them. Homozygous are those with white areas that lack spots. Also, homozygous are nightblind.

NZ Appaloosas Wed, 02/25/2009 - 16:36

On the nightblind, I would say that "studies seem to indicate" or words to that effect. There are a lot of people who say that the study done was insufficient, and IMO, it is always better to err on the side of caution than not.

I would also state that PATN-1 is theorized to be responsible for nose-to-toes patterning. Without tests, it's awkward, (again IMO) to state something as an absolute.

Diane

Daylene Alford Wed, 02/25/2009 - 20:41

I updated the white patterns page again and went ahead and posted a link to it at the top of the page. If you guys don't mind read through it one more time for me?

Thanks,

Daylene

NZ Appaloosas Thu, 02/26/2009 - 23:08

LP roan does not erase the spots, grey does. Also, I still recommend not being so absolute on LP causing nightblindness . It's the legal industry training coming out :HB

Diane

Daylene Alford Fri, 02/27/2009 - 08:24

I didn't mean to imply that LP roan took away the spots but it does sound that way now that you mentioned it. I'll change it and the night blindness also.

How about for LP roan. "LP roan is progressive reducing the base color (somewhat like gray) but leaves the color in the bony areas and the spots."

and for night blindness...

"Some recent studies seem to indicate that horses homozygous for LP will also suffer night blindness"?

Thanks much for the help,

Daylene

Monsterpony Fri, 02/27/2009 - 14:19

I still don't really agree with the inclusion of specifically labeled PATNs. It is more likely a polygenic trait and not that you breed a PATN-2 to a PATN-2 and get a PATN-2 foal. You breed a horse with a larger PATN expression to a horse with a smaller PATN expression and you are likely going to get something somewhere along the spectrum between their colors, but you may still get more or less than either parent.

Is there any way to seperate each gene with a line or something of that sort to show that they are distinct topics a little better? Maybe more space between?

Daylene Alford Fri, 02/27/2009 - 14:24

How about I just say that the inheritance of the pattern is not fully understood but it is believed to be controlled by at least two separate genes?

That should cover both ways.

Any news on when a test for LP will be forthcoming?