Why Are These Chicks Black If The Father Is A White Plymouth Rock?

[Pretty Birds]

For the OP's chicks:
If the White Rock father is barred (hidden by the white), then all chicks would carry one copy of barring. The chicks who have a barred mother (Marans, Delaware, Barred Rock) will have a larger yellow spot on the head IF they are male (because a male can have two copies of the barring gene, B.) Any female chicks, and any male chicks whose mother was not barred, should have a smaller or not-present head spot (because they'd only have one copy of B.) The chick from the Easter Egger, for example, will not be sexable by head-spot.

Thank you! This cleared up most of my confusion!

 

[Cyprus]

Yup. Lots of males

 

[Pretty Birds]

Yup. Lots of males

Your barred/cuckoo hens are producing black sex links when crossed with him.
Expect the ones with yellow spots on their heads to be males.

So the one that is half Cuckoo Maran is a male? All are they all males even though the mothers of some are not barred/cuckoo?

 

[Pretty Birds]

Any with head spots are males.
Any without head spots could be either sex since with your nonbarred hens your not producing sex links.

I am a bit confused... All the chicks, as you can see in the pictures, have a yellow spot on their head. Does this mean they will all be barred, even though the father and some of the mothers are not barred? Are they ALL males?

Since the male isn't barred they can only get that gene from their mother.

The father is not barred, but does he carry the barred gene because all the chicks have yellow spots on their heads? Some of the mothers are not barred either.

 

[Pretty Birds]

The chicks with the big, blotchy head spots are definitely males.

In the first picture I posted, there are two chicks in the front. Would the one on the left be a boy and the one on the right be a girl?

 

[Cyprus]

Oh h£ll, I wasn't thinking. You did say the rooster was a Plymouth rock didn't you?
When I had white rocks they were barred underneath.
Sorry for confusion/trouble I caused.

No worries. We all make mistakes or miss things, sometimes.

 

[Pretty Birds]

I see a few female chicks on that picture

Which ones? How can you tell? By the spots on their heads?

 

[Cyprus]

Not necessarily,

E/E, B/B rooster mated to none barred female will yield E/? B/- Females and B/b+ males, the males will still be identifiable from the females, females have a faint barely noticeable headspot, males even with heterozygous Barring(B/b+) will have a larger undefined headspot the will extend to the back of the head area just like your typical sex link chicks..

Black Sex link chick(E/eWh B/b+ chick)

Awesome. Thanks for the clarification.

 

[NatJ]

Extended Black(Homozygous or Heterozygous ) Males will have a larger uneven heaspot that extends to the back of the head(that is why I referenced the black sex link video so you and everyone can see the E/eWh, B/b+ chicks, dot pay attention to the female black chicks without barring)

Barred Rock Chicks can be sexed at hatch with good accuracy because the female headspot are small even shaped that only stay at the top of the head.

I thought the reason one can sex barred rock chicks or sexlinks is because the headspot size depends on how many copies of B are present. B/B in barred rock male is two copies (big headspot), B/- in barred rock female is one copy (little headspot). Sexlinks are B/b+ male one copy (little headspot), b+/- female no copies (no headspot). Which means a black sexlink male (B/b+) looks just like a barred rock female (B/-) (little headspot).

The barred rock males in the video have TWO copies of barring, so they are not a good example of what ONE copy of barring looks like.

 

[nicalandia]

The barred rock males in the video have TWO copies of barring, so they are not a good example of what ONE copy of barring looks like.

Hence the video I posted about the Black Sex Links(with B/b+ males) in Extended Black background(Homozygous and Heterozygous) a single copy of Barring will give the same headspot shape and size as homozygous chicks, the only different will be that Homozygous chiks are paler in color(dark grey) and Heterozygous chicks are pitch black.

Why the difference between Heterozygous barred males (B/b+) and Hemizygous barred females(B/-)? I suspect that it has to do with male vs female hormone levels at skin level, I suspect that Henny Feathering Barred males will look just like females but have not been able to find chicks of such genetics