In my previous post I discussed how advantage at a yearling or two year old sale can be found by looking specifically at offspring out of mares that have a CPI of 2.62 or better. Foals out of these mares represent an advantage over mares that have lesser race performance, all other things being equal. I also discussed how through the concept of missing heritability by specifically selecting for mares that could run themselves, we are hoping to diminish this effect that can in