I used the same set of hens and roo last summer. I hatched ALL year long last year... I really didn't notice it being an issue until just recently.
That may of been because I had so many other defects that I was culling hard for.
Middle toe feathering was not an issue for the parents... Of the offspring, I have two really nice specimens. They are my favorites from all the rounds of culling and are carrying the middle toe feather. One is a hen and the other is a young cockerel.....
The question was is it an even split.... Well, I know for a fact that I produced a heck of a site more MALES than I did females last year LOL...
I produced 5 males for every single female BCM. . . . Right now, just looking at what I have left on the property it would appear evenly split. However, considering how many males I hatched and how that wasn't one of my big issues - IDK....
Typically, I wouldn't keep or use a bird with a middle toe feathering. However, these two birds are so much better (IMHO) than ALL the others that I hatched last year that I have to TRY something with them. Originally, I had planned on breeding these two together BUT not anymore. The cockerel I am going to use over a clean shank hen. The hen with the middle toe feathering I really really, Really, REALLY, like... will just have to set out of action until this fall.
I don't want to mate her back to dad because he would take away from her type, although he has wonderful shank feathering... UGGH. I will just have to wait and see what the middle toe feathered cockerel and clean shank hen produced... SLOW going here, REALLY SLOW going...