comb genetics-dominant?

[klf73]

Does anyone know of a place that I can find an easy explanation of combs? Like which are dominant etc...
thanks

 

[TimG]

Try this link.

 

[Kev]

Fast answer: all comb types dominant over single comb. Pea and rose* combine to create the walnut comb.

Breda combless is recessive but it's just about non-existent in USA.

*edited to correct my mistake, thanks Sonoran!

 

[Krys109uk]

Someone here did once post a link to a website showing lots of different types of combs. There is a bit more to the subject than single, pea, rose or combined.

 

[rodriguezpoultry]

Quote:
IDK. When I bred my Black Australorps to my Light Brahma male, ALL of the males had single combs. The females had pea x single comb "mush" combs.

 

[Sonoran Silkies]

Pea & ROSE combine to create walnut. But not all silkies have true walnut combs.

There is also V-type, duplex and buttercup. And comb modifiers.

Some of the combinations can create pretty weird/unusual combs.

I have a young cockerel (he lives up to his name of Cocky Locky, aka Brat) who has something that I assume is a form of rose comb. It is narrow and sticks up somewhat like a single comb, but no serrations and it has a point at the end like a rose comb.

I have a couple more boys who have double single combs--sorta. The combs start as a single comb, but after the first "tooth" split into two single combs. An aerial view would show it shaped like a wedge or arrow pointing in the same direction as his head.

 

[Kev]

Quote:
IDK. When I bred my Black Australorps to my Light Brahma male, ALL of the males had single combs. The females had pea x single comb "mush" combs.

Pea is dominant. Dominant basically means "trait shows up in a cross". A cross of PURE pea comb and a single comb= ALL pea combed offspring. But yes, often the pea combs look odd, either squiggly, looking like a chewed up bubblegum etc.

Your cross would indicate the Brahma male probably was not pure for pea comb and the sex segregation was coincidence.

 

[Sonoran Silkies]

When I bred my Black Australorps to my Light Brahma male, ALL of the males had single combs. The females had pea x single comb "mush" combs.

Not sure what a "mush" comb is

Your brahma cock must have been Pp. While that theoretically should have given half the offspring P and the other half p, equally divided amongst the genders, you sometimes have to breed a whole lot of babies for the numbers to be correct.

If I remember Probability correctly, technically it's not that half the offspring will inherit each variation, but that each offspring has a 50% chance of inheriting each of the two choices. The more trials (or for us, chicks hatched) the closer the actual number is to matching the expected percentages. And the fewer trials the more likely Murphy intervened and said. "Not on my watch"

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[Kev]

Quote:
Thanks for the correction(rose). Rose comb can be quite varied in appearence. If the shape gives an impression of being more or less oval or triangular shape when viewed from above, it's a rose. Rose combs can be either tight to the head or 'high' like that cockerel's.

The split single comb often is referred to as duplex. Personally I have some skepticism as to duplex being a true gene- all 'duplex' birds I got were out of crosses with crested birds.. I just wonder if the comb splitting is just due to shifting/spreading around of the skull anatomy?

 

[Sonoran Silkies]

With my boys the combs are definite crosses--daddy was single, mama was walnut. These guys are part of my dun breeding project.

http://www.geocities.com/Petsburgh/6624/index.html shows photos of a modified rose comb (on a silkie) vs a true walnut comb (also on a silkie). And also has some additional comb information and interesting stuff.