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His kit lethality score is quite low - it's because of his roan. He should be safe to breed to just about anything, because only bad luck breedings with super high kit score mares should result in lethal foals.

@OakCreek13 This is quite a useful post about the kit lethality, with a handy dandy chart!

http://hj2.huntandjump.com/forum/discussion/13757/new-kit-lethality-and-kit-mutation-load-explained#Item_12

Anything over 100 produces dead foal.

The first couple of seasons after kit lethality was updated to its current form, the number was displayed for each foal when it was bred, so we could get used to the new system (before certain certain kit genes were always lethal when homozygous or in combination). There is no test which will give you the kit lethality number, although it is probably possible to figure it out from the calculation matrix chart Ammit posted the link to below the colored chart. If your horse only has 2 kit mutations, find where the row for one gene meets the column for the other. The 1 through 6 below each gene on the top represent WF from none through extensive. So a horse with w20sb1 and extensive WF has a kit mutation load of 51 and one with W1W1and WF none has a kit load of 90. For a horse with only 1 kit mutation, I would look at the number for crossing it with roan and subtract the 10 that roan always contributes.

Finding the actual number for each horse is more work than I generally bother with, though. If I am contemplating breeding horses with kit mutations together, I just check the chart to see how much WF factor is safe for the potential combinations (keeping in mind that there is a random number as well as the parents' WF involved in determining the foal's WF).