Out of the black rooster\'s 100, I got nearly all black (which I expected) but a couple blue.
Out of the blue rooster\'s 100, I got nearly half black and half blue, a couple splash, a couple with black bodies and brown heads and a couple solid chocolate brown. I was surprised to get so many blues out of so many odd colored hens and no chipmunks.
I kept a few just to see if the blues are really blues and see how the other 4 color out.
From the first (black) rooster, he is most likely E (extended black) or E>R (birchen with melanizers). The \"blues\" you got from this rooster resulted from the BL gene in the females he was mated with, as he has no ability to transmit blue.
From the second (blue) rooster, same genetics with the addition of Bl, which the first rooster did not have. When mated with non-blue females he would be expected to throw blue in about half his chicks. Had he been a splash, he would have transmitted Bl to all of them.
Very few if any males from these matings are likely to remain all black or all blue. Most will develop off-color feathers in their head, hackles, perhaps backs and wings as well. More of the females will remain one solid color, but they will likely transmit off-coloring to their male offspring. You probably have no idea how difficult it was to breed up solid black and solid blue males from the original easter egger stock, which is why outcrosses to other breeds became necessary.
Your brown chicks probably inherited from their mothers the e>b (brown) gene instead of E or E>R. So they are pretty much all definitely hybrids, genetically, despite their current chick down color. They will not breed true to color.
