I was told that breeding a Golden roo to a Silver hen will often render Buff Sebrights. I'm attempting that, now. The 2 girls (the Golden hen is VERY young and has just started laying) lay: Silver 2-4 per week, the Golden has just started and I get maybe 1-2 per week. BUT, it is also still very early in the year, and coldish, sooo...Not too bad, compared to what I was expecting from being told that they weren't good layers.
Another point about Sir John Sebright; He invented Darwin's "Natural Selection Theory, actually. Darwin asked the livestock developer (Sir John liked all sorts of domestic animals) to talk to him about his theories. Darwin got the credit, Sir John has a chicken (The only chicken named for a man, I've read) named after him.
My Golden Roo attacks EVERY hand that enters his tractor, be it feed time, watering time, treats time; ATTACK! Survival of the fittest, I assume. He's defending his two ladies. As I am 6-4/220 and he's maybe 9" or 10" tall and 1/2 pound-ish(?), I'd say that he has courage. I like him. I think he's a lil Ranger, he just won't surrender, as is proper.