The obvious disdain of Aussie buyers for fillies is well known and solutions to this are constantly debated everywhere. When you look at it realistically though it's a hard sell. No mare has been truly dominant in harness racing practically ever like they can be in the thoroughbreds. Now I understand weight pull however look at Saturdays racing at Rosehill. The first seven in the golden slipper are fillies. Now that can't just be 2kgs. BMW winner is a mare.
I am getting to my question and keen to here answers from those breeders who know the ins and outs of the standardbred but why do thoroughbred mares/fillies seem to be able to compete with colts, particularly at the elite level, where Standardbreds clearly cannot? Is there some genetic disposition of standardbred mares that sets them at a disadvantage?