This is kind of what I settled on (the last part)! For my spreadsheet, I am putting something like F2a for the F1xBC1 to Legbar and F2b for the Welsummer BC. That may get more confusing in the long run, though!
I appreciate all the replies! I am trying not to go back to any purebreds at this...
Just thinking about this:
The BC1 girls are F1 x parent, so really, going back to an F1 would be like a BC2, or is BC2 only going back to the parent bird again?
I'm collecting eggs from a variety of hens penned with an F1 male and I'm working on my breeding spreadsheet where I track parentage and results, etc. I am not sure what to call the progeny of some of these.
One is an F1 hen so that would result in F2 progeny - easy. But I also have him with...