Only six stallions have at least eight sons represented by hips at Keeneland's yearling sale later this month. We look at the sale's count by sire-of-sire as well as by larger sire lines.

A couple of days ago we looked at how much influence Bold Ruler has had on Thoroughbred racing's top synthetic sires. So the question now is: are his bloodlines less present in poorer-performing all-weather studs?

It's no secret that progeny of Bold Ruler-line stallions have enjoyed success on synthetic racing surfaces. As all-weather tracks continue to flourish, let's take a look at some top synthetic sires to see how much influence they have from Bold Ruler and the larger Nasrullah line.