Rose and Pea Combs Who's Dominant Over Who ?

[RAREROO]

I know both Rose and Pea Combs are dominant over Single combs, but what about if they are crossed with each other ? What comb type comes out of that?

 

[Luckytaz]

I think it will produce a cushion comb.

 

[speckledhen]

Pea and rose usually produce a walnut comb, but I have one hen with a perfect single comb that came from a Wyandotte sire and an Ameraucana mom. Apparently, that occurs in about 25% of the cases when neither parent is pure for their type comb or something like that. Not sure which is actually dominant in a pea x rose, though. Surely our genetics folks will chime in on that one.

ETA: Was just reading Inheritance in Poultry on Google Books, which says the F1's will have walnut combs and the F2's will have single as well as pea and rose combs when you cross pea and rose combed birds. It doesn't say which is actually dominant to the other, except that they are both dominant to single combs, but you should look that up on Google Books. Can't copy it, but it's a good read. Also, look at Cytogenetics by S. Sundara Rajan which also has info for you to read.

 

[big medicine]

This is what turned up when I crossed Wyandotte in to start my blue laced red Brahma project.

 

[speckledhen]

That would be considered a cushion, right? Guess the answer isn't that simple, if so, LOL. It's interesting what happens with genes. They're like little leprechauns playing tricks, sometimes. I think with Wyandottes, it's interesting since many of those can be single combed anyway, or at least, not pure for rose.

 

[snowbird]

In one of my Morley Jull books it says rosecomb and pea comb cross all the f1 had Walnut form combs. This is on page 207 it the book Poultry Breeding by Morley L. Jull and has a fairly large article. Don

 

[big medicine]

Yeah, I am a little grey on cushion vs walnut myself. I think it has to do with the "texture" for lack of a better word, cushion being smoother.

 

[RAREROO]

Thanks Bantam Ameraucanas and dAnvers are the breeds I was thinking about crossing one day ( that is if I get them, hopefully next spring)

Thanks to Chris for finding all these cool diagrams for us and having them put in this sticky https://www.backyardchickens.com/forum/viewtopic.php?id=343605 I just remembered those diagrams he posted so I looked at them and it does look like a cushion comb from what I can tell from the diagram. But either way, any thing would be fine with me Walnut,Cushion, Rose, Pea ,either would be fine, I was just wandering if there was a definite answer.

 

[Chris09]

There is 16 different combination that you could get from crossing a Pea to a Rose Comb.
From what I understand you can different look with different combination and depending on the combination of genes you could get Cushion Comb, Walnut Comb, Strawberry or Raspberry and variations of any one of these combs.

Cushion:
A low, compact comb of relatively small size, it should be quite smooth, possess no depressions or no spikes and not extend beyond the mid point of the skull. [like in the Chantecler]

Walnut:
A solid, moderately broad comb resulting from the combination of two dominant alleles for the Rose (R) and Pea (P) comb, with a surface that shows some furrowing reminiscent of a walnut half. [like in the Silkie]

Strawberry:
A low set, compact comb of somewhat egg shape with the larger portion forward and the rear extending no further than the midpoint of the skull. [like in the Malay]

Raspberry
A comb somewhat resembling a raspberry cut through its axis (lengthwise) and covered with small protuberances. [like in the Russian Orloffs]


Chris

 

[Sonoran Silkies]

Quote:
And it is various comb modifier genes that determine which of htese, and the exact appearance.