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Actually, the pea comb ones still exist, but they are a separate breed called Buckeyes. Buckeyes and Rhode Island Reds were being developed around the same time, and were temporarily considered to be versions of the same breed, but then the woman who developed the Buckeyes decided the Rhode...

I would expect long tail to hinder survival. Of course it won't change the instincts, but it has the potential to tangle on things, or slow the bird down, when the bird needs to move fast to hide or get away from predators.

Did the first one have a double yolk?

Yes, that's what makes it so hard to figure out: he has genes for egg color, but because he does not lay eggs you are stuck guessing from his mother's egg color and his daughters' egg colors. But his daughters have genes from their mother and from him, and he got genes from both his mother and...

I have no idea about the bloom. I've read that darker is dominant over lighter for most of the brown egg genes. There are apparently quite a few of them, but I haven't learned much about them, and they do not seem to be as well studied as many of the feather-color genes are. Studying them would...

I sometimes hear of rare breeds that are supposed to lay very early, but I'm not surprised that the actual early layers were modern production types :)

For the pullets that laid so early, does that seem related to what breeds they are, or just individual variation among pullets?

Yes, but you keep putting it in the wrong order, which is what I was trying to point out.

He's quite big! Just a comment: Barred is the color, Plymouth Rock is the breed. The color name is supposed to come before the breed name, not in the middle of it. So he would be a Heritage Barred Plymouth Rock (slightly different order of words.)

Splash only affects black. So she could be (genetically) a wheaten chicken with black speckles in the hackles. And then splash (two copies of the blue gene) turns those black bits into white bits. Dominant White could do the same thing, turning black into white without affecting the red & gold...

Yes, you know he has PP. I was agreeing with you there. My point was that you do not know whether he has RR or Rr or rr. Having dewlap and no wattles tells you nothing about whether he has a walnut comb (pea + rose) or a plain pea comb (no rose).

Quoting myself because I left out the most important word the first time. That "NOT" was missing, and of course that changes the entire meaning. Yes, so you know he is PP, but he could be PP rr; or PP Rr; or PP RR. All three of those would have no wattles, and could have the dewlap. PP Rr and...

I'm pretty sure the first poster in that thread is also the author of the article I found. Lacking wattles and possessing a dewlap means they have the pea comb gene, but it does not say whether they have the rose comb gene as well. So from your description, I cannot tell whether they've got...

This is the most detailed article I've found about Silkie combs: www.chickencolours.com/wp-content/uploads/2019/12/What-Wattles-lowres.pdf

Um, do you have a source for that? I've read the opposite: that Silkies should always have the rose comb gene, but that they should not have the pea comb gene, and thus not a true walnut comb. (When a chicken has two copies of pea comb, the wattles are much smaller than on other chickens...