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Barring inhibiting dermal melanin...

Discussion in 'General breed discussions & FAQ' started by Svarthona, Jul 11, 2010.

  1. Svarthona

    Svarthona Songster

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    From what I read it is supposed to do that... but how does the "inhibiting" actually look?
    I mean is it fully inhibiting the expression of dermal melanin or just partly?
    I have two barred pullets with kind of "blotchy" darkish spots in the umm "underlayer" of the skin on their shanks and feet ... and I´m hoping that that´s how id+ looks on a barred bird [​IMG]
    So it would be great if someone could explain to me how the inhibited id+ appears.
     

  2. blackdotte

    blackdotte Songster

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    Barring, like the Dermal Inhibitor I^d, is sex linked. Male being B/B have twice the inhibiting effect of hens that are B/-. Barred/cuckoo hens will always have more colour in the shanks than males.
    david
     
  3. Svarthona

    Svarthona Songster

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    True, but when a male has two copies of the barring gene B/B and two copies of id/id I´d imagine that it should equal out to the same optics as on a hen who can just have one copy of each B/- and id/- [​IMG] no?
    And hmm since the barring gene is an "ON" gene and the id is an "OFF" gene an Id/id bird would not show dermal melanin anyways, regardless of B/B or B/b... but an B/b id/id rooster would probably show more dermal melanin than one with two copies, if that makes sense [​IMG] this is mindboggling. And still leaves me in the dark of how that should actually express on a bird.
     
    Last edited: Jul 12, 2010
  4. nzpouter

    nzpouter Songster

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    Svarthöna :

    From what I read it is supposed to do that... but how does the "inhibiting" actually look?
    I mean is it fully inhibiting the expression of dermal melanin or just partly?

    guess it'll be something like this... note the black spots on the cockerel's face..

    [​IMG]
     
  5. muddyhorse

    muddyhorse Songster

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    Ok I'm not an expert but... this is my cuckoo silkie roo. instead of having all over black skin like he should he has mottled skin.
    [​IMG]
    he has spots on his comb he is also my avatar
     
  6. blackdotte

    blackdotte Songster

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    Due to the tight linkage between B & I^d they are invariably inherited together, thus the males are normally B/B I^d/I^d & hens B/- I^d/-.
    The odds of splitting B & I^d, and having them segregate is about 4000:1
    Good luck you will need to breed a lot of chicks.
     
  7. [​IMG]
    Barred and partially inhibited.
    [​IMG]
    Lisa
     

  8. Svarthona

    Svarthona Songster

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    Aww thanks a lot for all the answers and pictures [​IMG]

    I have a barred hen with those spots on the wattles, too. And I had a B/b cockerel with the same spots last year, but we ate him ... yeah, *doh*. Anyways, the two pullets with the spotted feet are too young to have much of a comb or wattles, so I can´t say yet if they have spots there, too. The hen with the spots, like in the first two pics of nzpouter and muddyhorse, has plain white feet though. So I figured that may be Fm which is showing, without id...

    My two pullets have feet exactly like Lisa's bird [​IMG] so it seems I can consider myself statistically lucky already. [​IMG]
    If they should ever stand still I´ll try getting a pic of them... but so far I got lots of shots with blurred parts of pullets or grass or other curious chickens trying to peck at the lens [​IMG]

    Oh and not sure if that makes any genetic difference, but Fm and id are not from silkies in my flock. It´s from a phenotype Swedish black hen and my B/b rooster having similar spotted feet. And since this two pullets are the first two from his offspring which inherited those odd spotted feet I figured I´d finally ask if it indeed is what I thought it could be.

    Thanks again for your help [​IMG] I guess I have a project plan now.
     
  9. Svarthona

    Svarthona Songster

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    Pictures...
    The best three pix after an afternoon in the grass photographing lots and lots of chicken feet [​IMG] I´m really glad nobody saw me.
    The bright sunshine kind of washed out half of the flecks.
    Both of them are almost 8 weeks old.
    Bird 1
    [​IMG]
    [​IMG]
    Bird 2
    [​IMG]
    [​IMG]
    [​IMG]
     

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