Pedigree Query

This week the Racing Post published that his first five mares are in foal.

As I am a huge fan of his sire line, I hope he will be a successful stallion.
As the dam line is American, can you say something more about it?

I found this on the Darley site:

http://www.darley.co.uk/stallions/our-s ... h/pedigree

Thank very much!