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Their sire is probably a higher A, while these are low blues.

ABOUT as good as. ;) You know he is a bottom level B from that test result since he is only about as good as a C stud.

Yep! That was an example that just because a horse papers higher doesn’t necessarily mean they will pass SBA :)

There is considerable variation in the level of breeding ability any horse can contribute to a foal. I once had a C papered stallion in a pasture with Yellow papered mares who gave me 3 A papered colts over a couple of seasons, but that doesn't happen often.

A long time ago, someone once did a test with perfect foundations and found that the offspring of a perfect foundation mare and a perfect foundation stallion* could have PT scores ranged from 8.9 to 10.4. That's just showing ability, of course, but showing ability is divided into finer gradations than paper levels, and those exact scores are completely hidden from us, which makes predicting possible papering results much harder.

*Perfect foundations have breeding ability at the top end of the C/Yellow level, 9.9 PT scores, and perfect consistency (same score both times they are shown in a week).

Just means this sire is better than I thought he was, as I had lots of other Blues out of him and AGA red mares, but these two failed - so they must have just been worse than the sire (low Blue). :D

Got it, sorry for the misinformation!

The sire of the two original foals is a very low A not a high A. The B papered stud being about as good as prooves he is at the total bottom of the A scale.

Do you have any reds or B's by him that passed testing? I'd assume not. The AGA is up to 4 points difference I think for memory, so your stallion might be a couple of points higher than the very lowest A, so the very lowest blue/A's might not pass. Consistency is another thing that affected pass rate for a time, not sure if it still does, or if so what sort of a sliding scale it is