clodiloa, 31-8-2011 7:29:
Ok,thank you for your new explanation.
My cock is a light silver partrige, but it seems a columbia. What do you think about? Clodiloa
I suppose your question is about the coloration ! We do it in the same way as with the hen .
How to approach this situation ?
First we have to know what are the color-genes he have and second what should be the color-genes he need. In this way we know what he need to become and what he must loose.
Now for me your "light" perniciata Argento cock have as genetic-code "eb/eb S/s+ Co/co+ Pg/pg+" and he should have "eb/eb S/S Co/Co pg+/pg+".
The Dominant gene Columbia, in this case heterozygote (in single doses) "Co/co+" is responsible (partly) for the pushing the black pigment to the endings (head/neck, tail, wings and foodfeathers). In a double doses this will give a better result.
The Dominant gene Pattern, in this case heterozygote (in single doses) "Pg/pg+" is responsible (partly) for the not pronounced mutiple pattern. Mostly as good as not to see on cocks.
To intensify the coloration you need to get in the gene Columbia in double doses (Co/Co) which he have now in a single doses and to get out the single doses for the multiple Pattern (pg+/pg+) which he have now in a single doses.
How you can do this ?
You need to cross him with a perniciata Argento hen,
only choses : a perniciata Argento hen who have the gene Columbia in a single doses (Co/co+)
and
only chose : a perniciata Argento hen who have the gene Pattern in a single doses (Pg/pg+).
That can bring you to a Columbia (looking) coloration : black patterned silver (incomplete) columbian (eb/eb Co/Co S/S*S/-).
From here it will be selection, selection, selection ... to can come to the better Columbia-colored subjects, and at the same time you need to do selections to become the better shapes.
An example, this is the result of 5 years selection for a "new" coloration and better type :
detail photo for the subtile coloration differences between grigioperla and Argento :
She is not yet finished in the itensification of the grigioperla. (making "new" colorations take mostly 7 generations).
[Modificato da Danny_57 31/08/2011 09:20]