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no, just luck of the draw, the average on blue to black is 50 % each, but that's just an odds number, could be more either way, just depends on what genetics each embryo inherits.
You were just a little over averge on the blues is all
With a black hen I tend to get 90% to 100% black. I've had a few hatches that were as low as 75% but few. I have to work at it, to get enough blues.....
mine did that last year too, blue roo to my black hens
This year it was totally opposite, 80% blue hatch
so again it's just an odds game. No rule on what will hatch, just an over all average