Comb Genetics

[nicalandia]

Quote:
That's because the Rose was Heterozygous for the rose comb(R/r+) meaning there was a 50% of obtaining a single combed bird.. which is alot...

 

[Sonoran Silkies]

Quote:
Nope. I don't recall all the additional genes that create cushion. But R/R P/P is walnut.

Words from the Good Doctor..

R. Okimoto :

Walnut and cushion comb are the same things. There are modifiers that make a rose comb smooth or bumpy. Wyandottes have the smooth short rose comb coming into fashion. While rose comb bantams still have the long pointed rose comb with bumps on it. Cushion comb probably has the smooth modifiers.

The buttercup comb is due to another dominant gene D. The buttercup comb is less dominant than the Lefleche type two horned duplex comb. The alleles are called Dv for the most dominant duplex comb and Dc for the cup type comb. Dv is found in Polish and is associated with cavernous nostrils (big nose holes in the beak). The Dc allele seems to cut the single comb down the middle and makes two combs. The buttercup allele is probably responsible for the stag horn duplex comb found in some Houdans. The crest modifies comb morphology by shortening the comb and pushing it more to the forhead.

The standard states that Silkies have walnut combs, but the original silkies had a trifid comb. The trifid comb was characterized by Punnett as being a rose comb variant. He did not see pea comb in his silkie crosses and he was the one that determined the genetics of walnut comb, so if Silkies had walnut Punnett was the guy that should have known this.

There is a recessive combless type called Breda. The original wild Red Junglefowl had combless females. These seem to be extinct in the wild and the wild populations seem to have domestic blood in them now. There is still a line of Red Junglefowl in the US that has the original type.
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You beat me to it, lol. Somewhere in another post he mentioned that silkie breeders knew the genetics of walnut comb and had undoubtedly bred pea comb in at some point. I know that I have had silkies with pea combs on occasion.

 

[CrestedGirl]

Quote:
Rose comb, Pea comb, are dominant over single comb


Quote:
you will get a rose combed bird..

We crossed a Bramha hen with a cochin roo and the male offspring had a single comb, But we crossed the the same 2 birds and the female has a pea comb.

 

[nicalandia]

Quote:

Quote:
Rose comb, Pea comb, are dominant over single comb


Quote:
you will get a rose combed bird..

We crossed a Bramha hen with a cochin roo and the male offspring had a single comb, But we crossed the the same 2 birds and the female has a pea comb.

read below quotes
Quote:
that is correct if the Rose combed bird was Heterozygous for Rose Comb(only one copy of it)

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this post is for people interested in silkie walnut combs genetics..

nice reading from "None-Bearded Silkies Can't have Wualnut Combs"
http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=94714&page=1

Quote:
Nicest Cushion comb I have seen so far..

 

[Chris09]

Quote:
If both parents are pure for comb type,
Rose Comb x Single Comb = All offspring Rose Combed but with some minor flaws.

If you breed offspring together or Rose Comb offspring back to Single Comb the Rose Combs that come out of this cross will suffer greatly. They will have hollow centers, mutable spikes, over sized combs, narrow combs, Double Combs, etc.

Chris

 

[nicalandia]

Quote:
If both parents are pure for comb type,
Rose Comb x Single Comb = All offspring Rose Combed but with some minor flaws.

If you breed offspring together or Rose Comb offspring back to Single Comb the Rose Combs that come out of this cross will suffer greatly. They will have hollow centers, mutable spikes, over sized combs, narrow combs, Double Combs, etc.

Chris

unlike Pea Comb, Rose comb is considered a completely dominant trait, There may be copy number differences in comb mass, but the structure of the comb is not intermediate.

 

[Chris09]

Quote:
If both parents are pure for comb type,
Rose Comb x Single Comb = All offspring Rose Combed but with some minor flaws.

If you breed offspring together or Rose Comb offspring back to Single Comb the Rose Combs that come out of this cross will suffer greatly. They will have hollow centers, mutable spikes, over sized combs, narrow combs, Double Combs, etc.

Chris

unlike Pea Comb, Rose comb is considered a completely dominant trait, There may be copy number differences in comb mass, but the structure of the comb is not intermediate.

You would be surprised how much crossing Single Comb to Rose Comb and back crossing or line breeding will screw up a good Rose Comb.
I have been crossing Single Comb/ Rose Comb Rhode Island Reds for some time now and seen the out come.

Rooster with over size comb with hollow center out of a SC/ RC cross

Young Cockerel with Narrow Comb out of a SC/ RC cross

Cockerel with Double Comb out of a SC/ RC cross

Chris

 

[nicalandia]

Quote:
First hand experience beats hand book knowledge...

Rose Comb is suppose to be one of the few "Completely Dominant" gene(most are incompletely dominant) that's why most wyandotte breeders keep getting single comb hatch from time to time... but as you pointed out there are other factors that could affect the outcome..

 

[Chris09]

Quote:
First hand experience beats hand book knowledge...

Rose Comb is suppose to be one of the few "Completely Dominant" gene(most are incompletely dominant) that's why most wyandotte breeders keep getting single comb hatch from time to time... but as you pointed out there are other factors that could affect the outcome..

I've been breeding Reds for 10 years now and it still surprises me when a "odd" formed comb pops up.
I'm still waiting for the Pea Comb Gene to pop up in my line breeding from the Malay that was used to create the Rhode Island Red.

Chris

 

[kfacres]

Quote:
Nope. I don't recall all the additional genes that create cushion. But R/R P/P is walnut.

Words from the Good Doctor..

R. Okimoto :

Walnut and cushion comb are the same things. There are modifiers that make a rose comb smooth or bumpy. Wyandottes have the smooth short rose comb coming into fashion. While rose comb bantams still have the long pointed rose comb with bumps on it. Cushion comb probably has the smooth modifiers.

The buttercup comb is due to another dominant gene D. The buttercup comb is less dominant than the Lefleche type two horned duplex comb. The alleles are called Dv for the most dominant duplex comb and Dc for the cup type comb. Dv is found in Polish and is associated with cavernous nostrils (big nose holes in the beak). The Dc allele seems to cut the single comb down the middle and makes two combs. The buttercup allele is probably responsible for the stag horn duplex comb found in some Houdans. The crest modifies comb morphology by shortening the comb and pushing it more to the forhead.

The standard states that Silkies have walnut combs, but the original silkies had a trifid comb. The trifid comb was characterized by Punnett as being a rose comb variant. He did not see pea comb in his silkie crosses and he was the one that determined the genetics of walnut comb, so if Silkies had walnut Punnett was the guy that should have known this.

There is a recessive combless type called Breda. The original wild Red Junglefowl had combless females. These seem to be extinct in the wild and the wild populations seem to have domestic blood in them now. There is still a line of Red Junglefowl in the US that has the original type.
​

well hot dang.. I'd say we were both right...