So i went and got the Awakened Draconium Chicken and multiplied the heck out of them, but its not producing the nuggets fast enough, so i went and captured one in a Soul Vial and made a Spawner from EnderIO ... however once hooked up, it spawns Random variants from the entire list rather than the specific Chicken i had captured

@Morpheus1101 its because spawner's don't save nbt data if I am not mistaken. but Mob Grinding Utils has a method with the Swab. Also hatchery will have a device (not yet next update)that can sort babys from adults that you could than kill, and use hatchery feeder to make them grow up faster.