@AMERAUCANAS4REAL
Where you getting this info?
Very interesting but I find it hard to believe.
It would be a huge project to bring in the fast feathering gene into a slow feathering breed or vice versa. Then keep the genes and get the bird back to standard.
And then maintain a breeding flock of both kinds to produce breeding stock to breed together for the sex able chicks.
Hatcheries breed too many sex links and have been vent sexing forever seems pretty extreme to go through all that when they already have there tested true methods.