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You can't just make it from scratch, its a sport mutation that just randomly popped up at some point, the way most all colors did, especially recessive ones. So you can't just make it. You have to find a bird that already has blue or splash and work from there.
Okay, that answers my question. So "back in the day" someone didn't cull the odd colored bird they used it!
Recently I've been hearing the term "sport" what does that mean?
Yep that's right they bred the odd colored bird back trying to replicate it. There is a story somewhere on a wedsite that sells. Blue jersey giants and it explained how it happened. And a sport is the odd colored bird that pops up. And sport is sometimes used refering to the Splash color, especially in gamefowl.