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White M can go with any white, as it is safe. White3 is another White that you have to be careful with or you can end up with a dead foal. White 20, I find tends to inhance any other white, so if your horse has it along with any other white, and you want to breed it to another White carrier, be extreemly careful, because it pushes up the dead foal factor (more likely to get a dead foal, than not.)

A while back, Ammit was actually showing with the horses how much of a chance the horse had to being a "dead" foal, by how much White the horse had. I did an experiment and bred this horse.


Kc2 H334 White Wonder

I posted what her White Mutation gene (Kit gene) showed, which was a 98%. So 2% more and she would have been a dead foal. She has White 1, and a large White Factor, but then she has W20, which pushed her to more White in coloring, as you can just see a smudge of color down her back. I made sure that when I bred her, I bred her to a horses that had no Kit genes and especially no W20.

The best way to learn about the genes, is to click on them and they take you to a site with information and pictures about them.
Hopefully other people that know more about this will chime in and correct anything I have posted wrong, but this is how I understand it.

I just looked at the chart, and basically I'd take it to mean never cross W10 and W with themselves or each other! Plus be careful when crossing W and W2 with other KIT genes other than tobiano and roan. W20 and M are pretty safe with each other just be careful again if crossing to W and W2. Higher white factor (WF in genetic results) will increase the risk if risky crossings too. W20 is your safest KIT gene after Tobiano and Roan

Ok, that makes sense thank you guys C:
I have a few w20 and frames mares I wanted to make sure we're ok with w3 and m. Thank you so much C:

This is the link to the colored Kit Lethality chart.
http://hj2.huntandjump.com/buddy_chat.php?chatid=3

The more colorful one is easier to understand, but the original chart is more specific.

Each Kit mutation is given a range of values depending on how high the White Factor of the horse is. The sections for each Kit mutation that are numbered from 1 to 6 refer to the amount of white factor. 1 = None; 2 = Minimal; 3 = Small; 4 = Medium; 5 = Large; 6 = Extensive.

Let's look at the numbers of Tobiano, one of the least lethal of the Kit mutations.

The Kit Load range for tobiano is from 5 to 10. If we say that the horizontal row is for the values of the sire, and the left-most column is for the values of the dam, then the chart is built by adding the appropriate values.

If both sire and dam have WF: None, then the Kit Mutation Load for the foal will be 5 + 5 or 10.

If both sire and dam have WF: Minimal adds 1 to the Kit Mutation Load for each parent, making the calculation 6 + 6 = 12.

WF: Light adds 2 to the Kit Mutation Load for each parent, or 7 + 7 = 14.

And so on. If you cross a tobiano stallion with White Factor None with a tobiano mare with White Factor Light, I think that will make the Kit Mutation Load for the foal 5 + 7 = 12.

Now, let's cross the tobiano stallions with White 1 mares (W). The range for White 1 is 45 to 95.

If we cross a tobiano stallion with WF: None with a White 1 mare with WF: None, the Kit Mutation Load on the foal will be 5 + 45 = 50. A safe cross.

However, for White 1, each step up in the White Factor amount adds 10 to the load from that parent, so when we get to WF: Extensive for the White 1 parent, the Kit Mutation Load for that horse is now 95. For a Tobiano sire with Extensive White Factor crossed with a White 1 dam with extensive white factor, the calculation becomes 10 + 95 = 105, and the foal dies.

In your original cross which was to be W8 with W20, you should be safe. However if you cross W20 with White 1 or White 2 and both parents have Extensive White Factor, the Kit Mutation Load for the foal will be pushed past 100, and the foal will die. Looking at the colored chart, you will see that crossing W8 with W 20 has a low risk because the Kit Mutation Load of the foal will not be more than 100 unless both parents have Extensive White Factor, though you might want to avoid those having Large WF as well.

All of this math is just me trying to interpret all those numbers on the original chart, so there might be something wrong in it. If so, Ammit will probably come along and correct me, as she often does when I'm trying to understand the mechanics of the game from the visible results. I'm always grateful when that happens.