I don't think so, I think it has more to do with the variety of turkey. I have seen the iridescence in both hens and toms of the Bronze variety. I see the pink in both the hens and toms of my Sweetgrass. It is possible that because toms are more likely to strut and spread their feathers out that it looks like they have more iridescence.Is it true that males have more iridescence in their feathers than females?