Ah. I see what you mean now. Emma is correct.
Crossing an AM with any other bird will either produce female offspring that lay blue OR green. Depends on the other parent. Thank you Emma.
They "technically" are not wrong, but each bird has 2 genes that "code" for their egg color. Brown (which is a brown coating over a white shell) can be IN a rooster's genotype along with a blue egg gene, but will be covered by blue (which is dominant). Then, it will not show unless he is test...
Can happen when the dad carries just one blue egg gene. Basically, blue and white work on the same gene, the one for egg "shells". White is what is underneath brown eggs, which is why the inside of a brown egg is white (once cracked). Blue is dominant over white. To get a white egg, 2 white eggs...
I see no male saddles, but the comb is suspicious. Likely a male at this point.
If he is indeed a boy:
Barred rock: Cross would be sexlinked. Males will be barred and females wouldn't. He looks like a pure AM to me, so the pullets of the cross would lay blue. This is true for every breed you...