There's not much information online about this breed.
From online sources I've read the cocks can grow 2' tall. At maturity cocks weighing up to 10 pounds and the hens to 7.5 pounds which may be the uppermost ranges.
I'm thinking they are related to Minorcas as the Google page says they were also called "French Minorcas" but were bred in the Barbezieux region of France and became a distinct line. But honestly not real sure.
There is a conservation group called "Aspoulba" Association poule de Barbezieux that was formed in 1997 to save and bring back the breed. However I don't speak French.
This may be the Google book your referring to which tells a little history on the breed. https://books.google.com/books?id=XvFAAQAAMAAJ&pg=PA109&lpg=PA109&dq=barbezieux+chickens&source=bl&ots=qO6OhTIf9P&sig=Cd5A9g6dIKjkIWhLbmN_5t0UBOQ&hl=en&sa=X&ved=0CDsQ6AEwBTgUahUKEwiog7fJpOjIAhXGdj4KHUtHDic#v=onepage&q=barbezieux%20chickens&f=false
From being around my birds they are flighty and scare easily. It may be that they are still young and could grow out of this. I try to work with them and sit in the coop. Some will jump in my lap but the majority of my flock don't want much to do with me, that is until I have treats.
Edited by Cody A - 10/30/15 at 6:16am