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There are a number of genetic mutations that result in a dead foal if the foal gets that mutated gene from both its parents. The technical term for those gene mutations is "homozygous lethal." This happens because the mutation breaks the gene so badly that unless a mutated allele is paired with a non-mutated allele some vital system is incomplete and the foal cannot survive.

There are several families of these genes in horses.

Frame, or Lethal White Overo, abbreviated in the game as Olw. If you breed two horses with this genetic mutation together, there is a 1 in 4 chance that the foal will inherit two mutated alleles. In real life the foals die shortly after birth from an incomplete digestive system. In the game they don't get born at all. The non-mutated symbol is O.

Dominant White mutations of the Kit gene. There are a great many of these in real life. Here in the game we have 4 variations--White 1, White 2, White 3, and White 4. Breeding two horses with any of these mutations has a 1 in 4 chance of the foal getting 2 mutated alleles. These foals, in real life, die in the uterus.

Sabino is another Kit mutation. We have 3 versions of Sabino in the game. All three can be safely crossed with each other, but Sabino 1 and Sabino 2 are lethal if combined with White 1 and White 2. Sabino 3 can be safely crossed with anything.

The other two Kit mutations, Roan and Tobiano, can be safely crossed with anything.

Splash has three variations in the game. Splash 1 and Splash 3 are found on the same chromosome. Splash 2 is a mutation of a separate chromosome.
Regular Splash (Sps) is not homozygous lethal. Both Splash 2 and Splash 3 are homozygous lethal. They are also lethal in combination. Both can be safely combined with Sps. The symbols for Splash 2 are PAX3+, no mutation; PAX3C7OY mutated allele. The symbol for the Splash 3 mutation is Sps3.

In the last sentence, Sandy ment "The symbol for Splash 3 mutation is Sps3" not Splash 2 ,that is the Pax one.

LOL, no worries, I just wanted to make sure she wasn't confused. I tend to mis-type things backwards a lot and have to slow myself down to fix them, so I'm used to fixing mis-types.

No I keep saying w10 is lethal with other lethal kit mutations. :)

Correct

Yes, Ichigo.

w10 is homozygous lethal with all other KIT mutations besides Roan, Tobiano, Sb3 and w20.

I am not able to see your chart Olas. Could you PM it to me, please? :)

Just post it on imgur.

Ammit has announced that there will be a temporary adjustment while she is working on the Kit gene image generation. Sabinos will be lethal with all Kit White mutations.

http://www.huntandjump.com/forum/discussion/12559/lethal-kit-combinations-have-been-slightly-changed#Item_3

This will change when she gets done, but there's no definite date for when that will happen.

Here are some quotes from Ammit in the similar thread at HaJ 2.

It's pretty much lethal w + sabino is dead foal. This is not a forever change but the transition from current KIT system to the new one is going to be a bit clunky.

All dominate white + the sabino's that where lethal before are now lethal together. And like I said this is not a permanent change nor a random change. It was vital for the transition process because the new w20 and w10s broke all the lethalality systems. There was however no warning. I did not know this was going to be required to keep breeding working. I would have posted a warning if I had known.

In the future some combos will be only sometimes lethal. The transition to more realistic KIT interactions is pretty complicated.

To add so it's totally clear. This wasn't me making a change because I wanted to. I would very much preferred it had stayed the same. This is me letting you guys know that this is the current functionality of the system, as best as I can make it work, at this moment.

Correct.

Drat, wish I had seen this before breeding a w4 X sabino :(

so is tobiano safe to cross with all other white patterns ? coz I have been crossing solid color to colored to be safe but now I've only got one stallion I can breed to my foals wen they old enough

Tobiano, roan, W20, and Sb3 are all safe to cross with everything and themselves. :D