Gramma...I do hold onto each and everyone of the roos, for a little bit...Even though I have the space to provide nice homes for all of them, I choose not to. Ill give an example...because they are autosexers, if I hatched out 17 roos and 6 hens...I hold onto all the roos and put out feelers for any lookers for them...if within a week I hear nothing...most likely 12 with be culled. these roosters, while rare, are still roosters. They can be used to create Olive eggers because of the blue egg gene they carry...which has been their saving grace for the most part...I'm always holding onto spares and growing out some. They have to be mated with another bird that is autosexable, like with the barred gene, to get the autosexing to work. They can't just be mated to any hen...
Luckily, no one blinks when I tell them Ill sell them some BUT they have to take a roo or three!! Lol
I dont think they will even be auto sexing if you mate to a barred gene chicken. Like barred rocks they use head dots to see sex not back down color. I know you can't make blacksexlinks with the barred rock since both parrents will carry the barred genes. I just did a search seems they cam cross with rhodebar gold bar and welbars to make auto sexing chicks. I hate chicken genetics gets confusing.