Originally Posted by wingstone
See now I am interested, are you saying that I could breed for all males to hatch if I was wanting to fill a grow out pen..
And yes understanding genetics should make a difference, how accurate are you on predicting what will hatch.
Well, the cross to determine gender before hatching is a silkie roo (and color but barred/cuckoo) over white leghorn hens. Supposedly, you can candle at some point and only the hens have dark legs, so you can identify them before hatching. IDK how practical that cross is for meat production, but let me give a more interesting example.
Before the broiler industry moved to cornish x rock crosses, many broilers were a cross between Delawares and New Hampshires. Those are both big birds, especially the males. A page or so back, we were discussing this cross to make red sex link layers. If you use hatchery birds, they aren't that big, because they are both bred for efficient egg production. If you get the heritage stock, they get much larger, but aren't as good as layers. Unless, you add in the hybrid vigor of the sex-link cross. They will not be the exceptional layers that the brown egg industry uses (ISA browns, mostly), but they will probably exceed the parent stock both the girls as layers and the boys as broilers. I don't want to raise broilers, but would love to have a good source of robust red-sexlink eggs to hatch. I bet I could find someone interested in taking all the silver (mostly white) males to raise for meat. If the hens have heritage qualities, they may not be the flash-in-the-pan that the commercial sexlinks are. The backyard hobbyists might find this to be the perfect layer, lasting much longer than the highly bred commercial sexlinks, and laying very large eggs as they get older. The commercial hatcheries select away from very large (or small) eggs, because the egg market is mostly for "large".