They list two for the United state, the w-36 and the Hyline Brown:I emailed a pic of my chicks to Chino Valley Ranchers indicating they hatched from TJ eggs. The guy told me they used both HyLine white hens and roosters for the fertile eggs.
The HyLine site: http://www.hyline.com/aspx/products/productinformation.aspx
Not sure which HyLine White these would be; as you can see from their site, they sport such cuddly names as HyLine W-36 and HyLine CV-22. I'm guessing HyLine takes steps to ensure its end result layers (and the accidental Roos that escape into laying facilities with the hens) don't breed true in order to protect their investment.
http://www.hylinena.com/aspx/productsandservices/productsandservices.aspx?eid=1