Depends on hatchery producing them, but most of the time it's Non barred hen or rooster, like a Rhode island red to a barred type like the barred rock. Most of the ones with alot of red use RIR hen to barred rock rooster, but some hatcheries do it other way around. They use birds that are good production birds to get the desired outcome of lots of eggs that are easily sexed at hatch. Doing that makes all chicks sexable at hatch due to the difference in the spot on head. Females no spot male's have spot. Asians are a new breed so may be next to impossible to know for sure without specific guidelines that would rule in or out certain features for each of your chickens. As far as the sex links, depending on hatchery you will get varying amounts of red in pullet offspring. Some ar the pe almost all black with only red stealing their head and neck and some have red breasts and thru the body. Unless someone on here has ordered some Asians specifically from same hatchery as yours you may not be able to tell difference. Unless Asian Roosters look a lot different from sex link roos, which look a lot like barred rocks but somewhat washed out define bars or less definitive barring. I'm am not sure what the Asian roos look like as I've never seen one in person. But all the pics of them I've seen look nothing like barred rocks. Leading me to think they may have been trying to sell BSL male's as Asians to rid themself of the BSL roos
