Thanks! I do have the SOP book, but it obviously doesn't include breeds that don't have an SOP. I also don't think it says at what age to cull birds, which is why I was wondering what others do. Sorry, I'm new and still reading/learning about the SOP and selecting breeding stock.
I'm sure this varies by breed, but is there a rough estimation? I have some breeds that I can't find a whole lot of information on (Pita Pinta Asturiana is the one I'm most interested in). At what age would you feel comfortable really assessing them to determine if they would be good breeding...