The question of whether male horses have an edge over female horses on all-weather (AW) tracks is one that often crops up among racing fans. It’s not just pub talk either – there’s actual data suggesting that colts and geldings do tend to outperform fillies and mares on these surfaces.

What Do the Stats Say?

Let’s start with the numbers. Stats show that male horses have a higher Impact Value (IV) compared to females on AW tracks. For context, IV measures how often a certain type of runner wins compared to its expected chance. Colts have an IV of around 1.46, while fillies sit at about 0.71. In plain English, colts are more than twice as likely to win as fillies in mixed-gender AW races.

The win rates back this up too. Colts win roughly 14% of their AW races, while fillies manage only about 7%. And if you’re looking at betting returns, backing colts still gives you a better shot at not losing your shirt, with a return on investment (ROI) of -16% compared to fillies at a painful -52%.

Why the Difference?

There are a few theories as to why males seem to have the upper hand. One idea is that colts and geldings generally have a more robust physical build, which may suit the demands of synthetic surfaces better than the lighter frames of fillies. Another theory is that the weight allowances given to fillies in mixed races might not be enough to fully balance the scales.

It’s also worth mentioning that AW tracks can sometimes suit certain running styles and stamina levels better than others. Male horses, especially colts, often have the kind of strength and speed that give them an edge in these conditions.

What Does This Mean for Bettors?

If you’re someone who studies form religiously or enjoys a weekend punt, this is something to keep in mind. It doesn’t mean you should automatically dismiss fillies in AW races, but being aware of this trend might help you make more informed decisions. As always, it’s about weighing up all the factors – but when it comes to AW racing, gender does seem to matter.

So next time you’re scanning the racecard for an AW meeting, give those colts and geldings an extra glance. The stats suggest they might just have the edge.